Question

Find the missing side of each triangle. Round your answers to the nearest tenth if necessary.

x
12 mi
15 mi
A) 9 mi
C) 7.9 mi
B) 17 mi
D) 19 mi

Answer 1

A. 9 mi.

Explanation:

Here, use the Pythagorean Theorem, but leave "a" as it is.

a² + b² = c²

a² + 12² = 15²

a² + 144 = 225

a² = 225 - 144

a² = 81

a = √81

a = 9

The missing side is 9 miles long.

Answer 2

9 miles

Explanation:

use Pythagoras theorem

15 squared - 12 squared = 81

square root of 81 is 9