OpenStudy (anonymous):

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

OpenStudy (across):

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.