Question

Find the missing length. Round to the nearest tenth, if necessary.

A. 441
B. 22.5
C. 64
D. 19.4

Answer 1

Using the Pythagorean theorem:

21^2 = √(8^2 + x^2)

441 = √( 64 + x)

441 - 64 = √x

377 = √x

x = √377

x = 19.4

The answer is D.