Question

test practice 5
what is the perimeter of a triangle with side lengths 3 in, 5 in, and 7 in.

Explanation:

Step1: Recall perimeter formula

The perimeter $P$ of a triangle is the sum of its side - lengths. If the side - lengths are $a$, $b$, and $c$, then $P=a + b + c$.

Step2: Substitute side - lengths

Here, $a = 3$ in, $b = 5$ in, and $c = 7$ in. So $P=3+5 + 7$.

Step3: Calculate sum

$3+5+7=15$ in.

Answer:

15 in