Question

what is the perimeter? if necessary, round to the nearest tenth.
$square$ millimeters
8.1 mm
5.7 mm
submit

Explanation:

Step1: Calculate hypotenuse $c$

$$c = \sqrt{(8.1)^2 + (5.7)^2}$$
$$c = \sqrt{65.61 + 32.49} = \sqrt{98.1} \approx 9.9$$

Step2: Sum all side lengths

$$\text{Perimeter} = 8.1 + 5.7 + 9.9$$

Answer:

23.7 millimeters