How can you prove a triangle is a right triangle?

The best way to prove that a triangle is a right triangle is to use the Pythagorean theorem because the Pythagorean theorem only works with right triangles. If a^2 + b^2 = c^2, then you are looking at a right triangle. 

0.69 yards

step-by-step explanation:

there are 36 inches in a yard

25 : 36 = 0.69 yards (you can round to 0.70)