Question

The measures of two of the sides of an equilateral triangle are 3x + 15 in. and 7x – 5 in. What is the measure of the third side in inches?

Answer 1

30

Explanation:

Answer 2

Answer: 30 in.

Explanation:

If it's an equilateral triangle, all sides are the same length. Therefore

3x + 15 = 7x - 5

x = 5

After figuring out x = 5, replace the x with five and solve the equation.

3(5) + 15 = 30

7(5) - 5 = 30

Now that we know the length of two sides, we can state that the third side-length also equals 30 inches because it is an equilateral triangle, meaning all sides are congruent/ the same.