Question

One side, in inches, of a triangle is 5 more than twice a number. If this is an equilateral

triangle, what is the perimeter ?

Answer 1

Definition of an equilateral triangle: A triangle with the exact same sides and angles, which is 60°

5 more than twice a number:

Let the number be x:

2x + 5

Since it is an equilateral triangle, multiply that by 3:

3(2x +5) = 6x + 15

The perimeter is (6x + 15) inches.