Question

Which side lengths represent the sides of a right triangle?
A)
2, 3, 5
B)
7, 24, 25
C)
7, 23, 25
D)
12, 16, 21

Answer 1

Use the Pythagorean theorem for each one and see if the equation is true. Use the largest number as your hypotenuse.

Answer 2

if a triangle has sides a,b,c, then the following must be true

a^2 + b^2 = c^2

in order for this triangle to be a right triangle (note: c is the longest side)

this is the converse of the pythagorean theorem