Please help! Will give brainliest!
Which set of side lengths form a right triangle?

3 ft, 6 ft, 5 ft

10 in., 41 in., 40 in.

15 m, 20 m, 25 m

7 cm, 8 cm, 10 cm

The third option.

Step-by-step explanation:

For a right triangle the square on longest side = sum of the squares on the other 2 sides (Pythagoras's Theorem).

25^2 = 625

15^2 + 20^2 = 625

So its the third set.