Posted by david on Thursday, July 15, 2010 at 2:26pm.
Which is closest to the length of the diagonal of a square whose sides measure 20 cm?
a.20 cm
b.28 cm
c.40 cm
d.200 cm

Pythagorean Theorem  Ms. Sue, Thursday, July 15, 2010 at 3:04pm
Which do you think is the right answer?
20^2 + 20^2 = c^2 
Pythagorean Theorem  GuruBlue, Thursday, July 15, 2010 at 3:06pm
The square on the hypotenuse us equal to the sum of the squares on the other two sides....
So square the sides to figure out the square on the diagonal side, then you can work out the length of that side. 
math  helen, Thursday, February 23, 2012 at 9:17am
40

Pythagorean Theorem  Ben, Tuesday, September 4, 2012 at 8:55am
40 cm