Question

The side length of an equilateral triangle is 4x – 5. Which expression represents

the perimeter of the triangle?
A) 4x – 15 B) 12x – 5 C) 12x – 15 D) 7x – 8

Answer 1

12x-15

Explanation:

A triangle has 3 sides

An equilateral triangle has 3 sides that are all the same length

The perimeter of a triangle is

P = s1+s2+s3

P = 4x-4 + 4x-5+4x-5

Combine like terms

P = 12x -15