find the perimeter. simplify your answer.

Explanation:

Step1: Recall perimeter formula

The perimeter $P$ of a triangle is the sum of the lengths of its sides. So $P=(c + 4)+8+(c + 1)$.

Step2: Combine like - terms

First, group the constant terms and the terms with the variable $c$: $P=(c + c)+(4 + 8+1)$. Then, simplify the sums: $P = 2c+13$.

Answer:

$2c + 13$