Question

what is the perimeter? if necessary, round to the nearest tenth.
$square$ inches

Explanation:

Step1: Find side $b$ via Pythagoras

$$b = \sqrt{9^2 - 2^2} = \sqrt{81 - 4} = \sqrt{77} \approx 8.77$$

Step2: Sum all sides for perimeter

$$\text{Perimeter} = 2 + 9 + 8.77$$

Answer:

19.8 inches