Question

what is the perimeter? if necessary, round to the nearest tenth._____ millimeters

Explanation:

Step1: Find hypotenuse via Pythagoras

$$c = \sqrt{33^2 + 56^2}$$
$$c = \sqrt{1089 + 3136} = \sqrt{4225} = 65$$

Step2: Sum all sides for perimeter

$$\text{Perimeter} = 33 + 56 + 65$$

Answer:

154.0 millimeters