Question

What is the length of the unknown side of the right triangle?

A. 21
B. 29
C. 400
D. 441

Answer 1

the answer is 29

Answer 2

B

Explanation:

Using Pythagoras' identity in the right triangle

x² = 20² + 21² = 400 + 441 = 841 ( take square root of both sides )

x =
`√(841)` = 29