Which of the following are measurements of the sides of a right triangle?

101, 99, 20

28, 26, 12

17, 14, 6

none of the above

First one 101, 99 and 20

For a triangle to be right angled the largest side squared must equal the sum of the squares on the other 2 sides (Pythagoras theorem)

1. 101^2 = 99^2 + 20^2 so its is right angled

2. 28^2 is not equal to 26^2 + 12^2 - not right angled

3. 17^2 not euql to 14^2 + 6^2 - not