Stump your fellow simians.
Small problem of trigonometri
by Sentzeu » Sun Sep 12, 2004 1:29 pm
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Consider the curve of y=cos(arcsin(x)), prove that the curve is equal to a unit circle.
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If you include those other values of the arcsin relation, eg arcsin(-1) = 3pi/4, arcsin(0) = pi, etc, you get a complete circle, no?
3 Replies
1036 Views
Last post by Stimpson J. Cat Wed Sep 15, 2004 2:07 pm
Touching pennies
by ceptimus » Mon Jul 26, 2004 7:46 am
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How many pennies can be arranged so that each penny touches every other penny. Don't just give a number; a description and/or diagram is required.
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okay, I have 5 in an unstable configuration.
15 Replies
2767 Views
Last post by exarch Wed Sep 15, 2004 12:51 pm
Monday's Cryptoquote
by whitefork » Thu Aug 19, 2004 12:56 pm
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Not difficult but pleasingly worded. Chiasmus, I think?
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* Looks sideways at Rob Lister for not hiding his answer in a spoiler box. *
6 Replies
1542 Views
Last post by exarch Tue Sep 14, 2004 3:03 pm
Socks in a box
by DanishDynamite » Sat Sep 11, 2004 11:11 am
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A box contains a number of socks, the number not exceeding 1993. Some socks are Red, some are Blue. The probability of randomly picking two socks of...
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Well done, folks.
4 Replies
1196 Views
Last post by DanishDynamite Mon Sep 13, 2004 3:42 pm
Notes in a hat
by DanishDynamite » Fri Sep 10, 2004 8:34 pm
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A hat contains 1992 pieces of paper in it, each piece of paper having its unique number in the range 1-1992 printed on it. A person picks two random...
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I have to say that Stimpy's solution was indeed very complex. I'm glad he added his Edited to add bit as that describes the core of the argument....
5 Replies
1180 Views
Last post by Stimpson J. Cat Sat Sep 11, 2004 4:01 pm
Another triangle
by DanishDynamite » Wed Sep 08, 2004 7:13 pm
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Given a right-angled triangle with the two sides of length 1, what is the shortest segment which divides this triangle into two figures with equal...
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Well done, millirem and ceptimus!
6 Replies
1365 Views
Last post by DanishDynamite Fri Sep 10, 2004 8:16 pm
21 Replies
2710 Views
Last post by MLynn Fri Sep 10, 2004 2:17 pm
A 10-year old triangle
by DanishDynamite » Mon Sep 06, 2004 7:20 pm
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Here's a fairly easy one.
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New problem:
6 Replies
1770 Views
Last post by millirem Thu Sep 09, 2004 12:44 am
How do you play games such as
by Guest » Fri Sep 03, 2004 3:00 pm
First post
Chess, poker,mah jong all those funky things that other people play?
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I'm only teasing, and by my post, you should know that. Seriously though, during my childhood, it was only old men who played pinochle. I know the...
9 Replies
1674 Views
Last post by Cloverlief Fri Sep 03, 2004 8:51 pm
This game is taking the country by storm!
by Nigel » Fri Sep 03, 2004 2:14 pm
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I can't call this a sport , and the country it's taking by storm is the rural countryside. Cornhole is a big pastime in my area. (I cannot stand the...
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Sooo...why is it fun?
2 Replies
779 Views
Last post by Nigel Fri Sep 03, 2004 7:15 pm
Abdul Alhazred's Go Fish challenge
by Skeptoid » Tue Aug 31, 2004 11:32 pm
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Got any threes? :D
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I have a trouser trout. Any comely young lasses may feel free to fish for it.
2 Replies
1062 Views
Last post by shemp Wed Sep 01, 2004 11:18 am
Who is Skeeve?
by tamiO » Mon Aug 02, 2004 6:39 pm
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... Upchurch being the apparent victim here...
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I was always more partial to Bunny. And Tananda... even if she is a Trollop.
48 Replies
7041 Views
Last post by Marian Wed Sep 01, 2004 3:12 am
Strawberries
by Sentzeu » Sun Aug 29, 2004 12:44 am
First post
Consider a ring of N strawberries. A little girls starts at a strawberry eats it and then skips the second one and eats the third, skips the fourth...
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This one in particular I got from an old Georg Mohr task, when I posted this particular puzzle I was to tired to make anything by myself.
5 Replies
1278 Views
Last post by DanishDynamite Mon Aug 30, 2004 8:20 pm
A whole lot of 1's
by DanishDynamite » Wed Aug 25, 2004 10:34 pm
First post
Okay, this is a toughie. In fact, I couldn't solve it myself and had to look at the answer. Still, I have some faith in the brainpower available...
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Yikes! This little puzzle has certainly expanded. And in some very interesting directions. Great stuff, xouper!
30 Replies
3737 Views
Last post by DanishDynamite Mon Aug 30, 2004 8:12 pm
Square of 16
by DanishDynamite » Wed Aug 11, 2004 8:56 pm
First post
I hesitate to post this puzzle as it is liable to be besmirched by ceptimus's brute force computer. :)
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Well done, xouper. Finally, this baby has been attended to in the manner it deserved. :)
5 Replies
1152 Views
Last post by DanishDynamite Mon Aug 30, 2004 8:08 pm
Palindromes
by Sentzeu » Thu Aug 26, 2004 6:18 pm
First post
Hi to you all, this is my first post. Here's the first math puzzle that I've ever submitted.
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I encountered this problem in a programming competetion.
3 Replies
914 Views
Last post by Sentzeu Thu Aug 26, 2004 7:42 pm
Poker problem
by RCC » Wed Aug 25, 2004 5:29 pm
First post
Oldie but a classic:
Last post
Ah ha. I didn't know you could check in 7 card stud.
6 Replies
1287 Views
Last post by RCC Thu Aug 26, 2004 7:36 pm
The Challenge Hand Review Thread
by RCC » Fri Aug 20, 2004 5:07 pm
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Where I review the hands played in the challenge, and try to see how many people I can bore and upset at the same time. 8)
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Much of this is mysterious to me.
10 Replies
1692 Views
Last post by RCC Wed Aug 25, 2004 3:04 am
What's the significance of this?
by whitefork » Thu Aug 12, 2004 12:36 pm
First post
It's a zipped Excel spreadsheet. What's it mean?
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Just out of curiousity, did you happen to know that or did you research it?
6 Replies
1392 Views
Last post by Sundog Tue Aug 24, 2004 7:20 pm
1 to 9
by DanishDynamite » Wed Aug 11, 2004 8:15 pm
First post
I wish I knew how to post diagrams in this place. This problem is somewhat difficult to describe without a diagram. Anyway, here goes...
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Yeah, except Cecil did it more succinctly and many days earlier... oh well.
14 Replies
1966 Views
Last post by Beleth Sat Aug 21, 2004 12:49 am
Circle of 10
by DanishDynamite » Tue Aug 17, 2004 4:02 pm
First post
For some unknown reason, ceptimus has written the following numbers on 10 pieces of paper: 1, 3, 4, 5, 7, 9, 11, 13, 15, and 17. Ceptimus now...
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The beauty of the computer version, is that with less than a minute's work, it can be altered to deal with any ten numbers, or indeed many more than...
4 Replies
1072 Views
Last post by ceptimus Wed Aug 18, 2004 11:29 pm
RCC's poker challenge: signup thread
by RCC » Fri Aug 13, 2004 7:14 pm
First post
This is the first attempt to hold a poker tournament on this very forum. The entry is free and first prize is a whopping $5 payable into a pokerstars...
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rebecca wrote
37 Replies
4937 Views
Last post by lofgeornost Tue Aug 17, 2004 1:47 am
poker follies
by varwoche » Tue Aug 03, 2004 4:25 pm
First post
I need a counseler. (Poker and/or psychological.)
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Placing humour opportunity over common sense, I PRESTO'ed:
66 Replies
9517 Views
Last post by rebecca Mon Aug 16, 2004 4:07 pm
Slicing pizza
by DanishDynamite » Tue Aug 10, 2004 9:43 pm
First post
Bob and his mom love pizza. Hence, they buy a pizza which happens to be shaped as an equal sided triangle. Bob, being a spoiled brat, demands to not...
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Hmmmm. Not the presentation I expected. Oh well, at least the drawing is there.
8 Replies
1393 Views
Last post by DanishDynamite Sun Aug 15, 2004 2:22 pm
I'll try in puzzles: Physics of acrobatics
by tesseract » Sun Aug 15, 2004 6:11 am
I tried this over in Science, but it might fit better in puzzles.
0 Replies
538 Views
Last post by tesseract Sun Aug 15, 2004 6:11 am
How many Calories?
by xouper » Sat Aug 14, 2004 9:34 am
First post
This should be an easy one.
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Well, a gallon is 3.785 liters and there's one kilogram to a liter of water. So your 64,000 gallons have a mass of 242240 kg.
1 Replies
701 Views
Last post by Zombified Sat Aug 14, 2004 11:06 am
Cross sums.
by Cecil » Sat Aug 14, 2004 12:01 am
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A cross sum is a number puzzle similar to a crossword. Each box contains exactly one digit from 1 to 9 (no repeating digits in each word). The clue...
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Just found this.
2 Replies
737 Views
Last post by Cecil Sat Aug 14, 2004 12:09 am
Looking for two puzzle books...need help.
by Andonyx » Thu Aug 12, 2004 3:51 pm
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Okay I realize that this is going to be like asking if you know which movie I'm thinking of that has that guy from that show that one time, so I...
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I had a similar book called MAZE . I never did solve it on my own, but years later I found a solution on the Internet... still, there are plenty of...
4 Replies
987 Views
Last post by Quester_X Thu Aug 12, 2004 10:16 pm
Flying the fast bird
by Skeeve » Wed Aug 11, 2004 10:10 pm
First post
An old math problem that I've encountered a few times along the way goes like this:
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The two trains are approacing each other at 15 + 45 MPH = 60 MPH. They are 120 miles apart. They will therefore meet after 2 hours.
5 Replies
1117 Views
Last post by En folkefiende Thu Aug 12, 2004 6:09 pm
WHo was first?
by latinijral » Fri Jul 23, 2004 4:55 am
First post
The egg or the chicken?
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PErhaps more to the philosophical, non-scientific point:
10 Replies
1702 Views
Last post by bjornart Thu Aug 12, 2004 10:57 am
Squares
by DanishDynamite » Wed Aug 11, 2004 4:14 pm
First post
Prove that for any whole number N > 5, a square can be divided into N squares.
Last post
Beautiful. I was approaching that, but I don't think I could have made the argument so elegantly.
6 Replies
1227 Views
Last post by gnome Thu Aug 12, 2004 12:01 am
The four parachutists
by ceptimus » Tue Jul 20, 2004 4:23 pm
First post
Three parachutists land at random positions within a large circular cornfield. Albert fears that Barbara hurt herself on landing, so he dumps his...
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Three parachutists land at random positions within a large circular cornfield. . . .
19 Replies
3271 Views
Last post by DanishDynamite Wed Aug 11, 2004 6:32 pm
Divisible by 11
by DanishDynamite » Mon Aug 09, 2004 3:20 pm
First post
Given that
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Sorry, my algebra is rusty. (Or maybe it's just my brain in general that is rusty.)
7 Replies
1812 Views
Last post by DanishDynamite Wed Aug 11, 2004 3:56 pm
3 circles and a tangent
by DanishDynamite » Sat Aug 07, 2004 1:03 am
First post
Suppose you have 3 unit circles (i.e radius = 1) whose centers are on a line and where each circle just touches at least one other circle. (Imagine 3...
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Nicely done, ceptimus. :)
5 Replies
1301 Views
Last post by DanishDynamite Mon Aug 09, 2004 3:15 pm
What hat at tea?
by ceptimus » Thu Jul 22, 2004 7:31 am
First post
I'm no good at word puzzles, but this one just occurred to me - I suppose it's been done before though.
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Telling arcticpenguin to give away his poor-quality rap music, and listen to the king of keyboard instruments instead:
8 Replies
2027 Views
Last post by ceptimus Fri Aug 06, 2004 5:18 pm
Pegs in holes
by ceptimus » Sun Jul 25, 2004 9:18 am
First post
What fits best - a square peg in a round hole, or a round peg in a square hole?
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I did not have any criteria in mind. That was why I asked.
12 Replies
2208 Views
Last post by DrMatt Mon Aug 02, 2004 4:07 pm
Pizza problem.
by Deetee » Fri Jul 30, 2004 4:54 pm
First post
Ceptimus was hungry,....very hungry.
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I'm going with Whim's solution, and filling in the blanks.
3 Replies
1096 Views
Last post by Electric Monk Sun Aug 01, 2004 6:55 pm
A different pizza problem
by Cecil » Sat Jul 31, 2004 3:35 am
First post
Well, it would seem that the nth cut can always be arranged to cross each of the previous n-1 cuts, creating n extra pieces of pizza.
Last post
I suppose we are limiting this in the following ways:
2 Replies
1434 Views
Last post by ceptimus Sat Jul 31, 2004 7:47 am
The lazy electrician.
by ceptimus » Tue Jul 20, 2004 4:12 pm
First post
By a remarkable coincidence, the positions of Tommy's shed, garage and greenhouse lie at three of the corners of a 100-metre square; his house lies...
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If you're going to nitpick, get it right! :)
12 Replies
2217 Views
Last post by WildCat Fri Jul 23, 2004 2:38 am
HEY WHERE DID ALL THIS GO????
by Skeeve » Tue Jul 20, 2004 2:54 am
First post
??????
Last post
Well, I hope this makes the spilt easier to deal with. :)
2 Replies
869 Views
Last post by skeptica Wed Jul 21, 2004 8:34 pm
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