MCQ - 121-11973

Correct Answer: C

Explanation:

The formula to find the perimeter of an equilateral triangle is

P = 3a

where a is the length of one side of the triangle. Because an equilateral triangle has 3 equal sides, we can use any side in the formula. To find the length of one side, we will solve for a.

Now, we know the perimeter of the triangle is 69in. So, we can substitute and solve for a. We get

69in = 3a

${\displaystyle \frac{69\text{in}}{3}=\frac{3a}{3}}$

23in = a

a = 23in

Therefore, the length of one side of the equilateral triangle is 23in.