Find the perimeter of a right triangle with legs of 20 cm, and 21 cm.

Question

a.882
b.82
c.70
d.47

I have no clue what to do. Can somebody help me with this please?

Answer 1

First you have to use the Pythagorean Theorem to find the hypotenuse of the right triangle. In this formula, c is the hypotenuse.

a^2 + b^2 = c^2

20^2 + 21^2 = c^2

400 + 441 = c^2
841 = c^2
29 = c

Now, add 20 + 21 + 29 to find the perimeter.