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Nelson

Nov 7, 2004 09:50 PM

Math Whiz's

My friend asked if anyone can help him on this lil thingamabob:

Quote:

a cylinder 60 cm high has a circumference of 20 cm. A string makes exactly 4 complete turns around the cylinder while its two ends touch the cylinder's top and bottom, like a barber's pole. how long is the string in cm?

No clue what's its for. It's too late for me to use my brain.

RB	Nov 7, 2004 09:53 PM

~132.7 cm

Nelson

Nov 7, 2004 09:58 PM

Found out it's my friend's cousin, for his prjoect or something. We told him to go to home depot and freakin' buy a 60 CM high cylinder with a 20 cm circumference and wrap a string see how long.

RB	Nov 7, 2004 10:02 PM

Quote:

Originally Posted by MaxBoosT

Found out it's my friend's cousin, for his prjoect or something. We told him to go to home depot and freakin' buy a 60 CM high cylinder with a 20 cm circumference and wrap a string see how long.

length = 60 cm

width of top and bottom = (Pi x diameter = 20) = 20/3.14159... = 6.366 cm

60 + 60 + 6.366 + 6.366 = 132.732 = ~132.7 cm

jclau00

Nov 7, 2004 10:06 PM

i say the answer is 100. pythagorean might come in handy *hint hint*

Nelson

Nov 7, 2004 10:09 PM

Interesting.
I didn't even attempt this, I already have a headache.
Good sh*t RB :bigok:

Kestrel

Nov 7, 2004 10:16 PM

Quote:

Originally Posted by jclau00

i say the answer is 100. pythagorean might come in handy *hint hint*

*ding ding ding*

"Unroll" the cylinder, and you will get four triangles. The hypotenuse of each one of these is 25 cm, so the total length is 100 cm.

RB	Nov 7, 2004 10:17 PM

ohhh, I read it wrong. I thought they meant wrap it up and down vertically :doh:

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