Which of these four sets of side lengths will form a right triangle? Set 1
StartRoot 2 EndRoot cm, 9 cm, StartRoot 7 EndRoot cm

Set 2
2 in., StartRoot 5 EndRoot in., 9 in.

Set 3
StartRoot 6 EndRoot mm, 2 mm, 10 mm

Set 4
StartRoot 2 EndRoot ft, StartRoot 7 EndRoot ft, 3 ft

Set 1
Set 2
Set 3
Set 4