Asked by kelsy

Find the perimeter of a right triangle with legs of 20 cm, and 21 cm.
a.882
b.82
c.70
d.47

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

Answers

Answered by Ms. Sue
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.

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