Question

What is the length of the sides of this equilateral triangle?

3x + 6
6x - 3
9x - 12

Answer 1

15

Explanation:

In an equilateral triangle all the sides length are the same. Set two sides equal to each other and solve for x

3x + 6 = 6x - 3 Subtract 3x from both sides

6 = 3x -3 Add 3 to both sides

9 = 3x Divide each side by 3

3 = x

Now that we know x is 3, plug this into the expression for any side and find the side length

3x + 6

3(3) + 6

9 + 6 = 15