Question

Which set of line segments with the given lengths form a right triangle ?

9, 25, 64

12, 16, 20

10, 24, 39

8, 15, 23

Answer 1

Do you know the 3-4-5 triangle?
\[12, 16, 20\rightarrow3(4), 4(4), 5(4)\]It's a 3-4-5 triangle, and therefore, a right triangle.