EPTQuick help with Math - Page 2
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rushz0rz
Canada5300 Posts
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EtherealDeath
United States8366 Posts
On September 17 2008 15:31 HeavOnEarth wrote: oh i just do uh whatever that property of multiplication is called where instead of 144 x 12, you do ( 144 x 2 )+( 144x 10)= ~, 144 x 2 , 288 ,easy in head, 144 x 10, 1440, easy in head, so add them ... 1440 ...+ 288 = 1728, carry the one :p Oh I just multiply it out cause it takes less than a second, at which point time is irrelevant. And it's not 1728, not the answer to the question anyways :-P | ||
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EtherealDeath
United States8366 Posts
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SayaSP
Laos5494 Posts
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HeavOnEarth
United States7087 Posts
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EtherealDeath
United States8366 Posts
On September 17 2008 15:38 SayaSP wrote: Isn't the formula for finding the diagonal like sqrt(3)*side That would be correct. But gotta let him find out why :-P | ||
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HeavOnEarth
United States7087 Posts
![[image loading]](http://i37.tinypic.com/bje5a8.jpg) | ||
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ketomai
United States2789 Posts
My advice, draw a picture. | ||
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geometryb
United States1249 Posts
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Nytefish
United Kingdom4282 Posts
 If you don't want to help then don't post. If you're just here to show off your (relatively) amazing Maths skills then go work in a nursery.For question one it's just trial and error. Starting with the 2nd statement and finding an 'x' that agrees with the first statement (and your common sense). ![[image loading]](http://www.mathaware.org/mam/00/master/essays/B3D/2/JPG/figure16.jpg) Using this picture and the fact that the longer diagonal is the diameter of the sphere, you can label a side (of the cube) 'x' and use some basic Pythagorus to find the longer diagonal in terms of x. | ||
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sigma_x
Australia285 Posts
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Nytefish
United Kingdom4282 Posts
I think assuming age is an integer is adequate, no need to be so "correct".  | ||
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