A right triangle has a hypotenuse of length 7 mm and one leg of length 3 mm.

How long is the other leg?

12.6 mm

2 mm

4 mm

6.3 mm

Option D is the correct answer.

Explanation:

By Pythagoras theorem we have

Hypotenuse² = Base² + Perpendicular²

Here hypotenuse = 7 mm

Let us consider other leg length given as base length

Base = 3 mm

So we have

7² = 3² + Perpendicular²

Perpendicular² = 40

Perpendicular = 6.3 mm

Other leg is 6.3 mm long.

Option D is the correct answer.