Question

9 yd, 8 yd, a (right triangle). what is the perimeter? if necessary, round to the nearest tenth.
____ yards

Explanation:

Step1: Find side $a$ via Pythagoras

$$a = \sqrt{9^2 - 8^2} = \sqrt{81 - 64} = \sqrt{17} \approx 4.123$$

Step2: Sum all sides for perimeter

$$\text{Perimeter} = 8 + 9 + 4.123$$

Answer:

21.1 yards