Question

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

Explanation:

Step1: Find hypotenuse via Pythagoras

$$c = \sqrt{4^2 + 9^2}$$
$$c = \sqrt{16 + 81} = \sqrt{97} \approx 9.8$$

Step2: Sum sides for perimeter

$$\text{Perimeter} = 4 + 9 + 9.8$$

Answer:

22.8 kilometers