posted by Help .
2) which set of measure could be the side lengths of a right triangle?
A. 0.9 cm, 1.2 cm, 1.5 cm
B. 4 in, 4 in, 4 in
C. 7 m, 8m, 9m******
D. 2ft, 3ft, 4ft
nope. Think of your ubiquitous 3-4-5 right triangle
(A) is that same triangle, scaled by .3
It's obvious that (C) is wrong, since 7^2+8^2 = 49+64 = 113, not 9^2=81
On a question like this, even if you're guessing, at least check to make sure your answer fits!