Question

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

Explanation:

Step1: Find hypotenuse length

Use Pythagorean theorem $c=\sqrt{a^{2}+b^{2}}$, where $a = 15$ and $b = 20$. So $c=\sqrt{15^{2}+20^{2}}=\sqrt{225 + 400}=\sqrt{625}=25$.

Step2: Calculate perimeter

Perimeter $P=a + b + c$, substituting $a = 15$, $b = 20$, $c = 25$, we get $P=15+20 + 25=60$.

Answer:

60