Question

ABC is an equilateral triangle.

If the mZA-7x -9.1.
Find the value of x rounded to the nearest tenth. (If your answer is exact. nlease nut at the end

Answer 1

Measure of all angles in equilateral triangle is 60°

So

• m<A=60
• 7x-9.1=60
• 7x=69.1
• x=9.9

Answer 2

• x = 9.9

Explanation:

An equilateral triangle is the triangle with equal interior angles.

Each angle has measure of 60°, therefore:

• m∠A = 60°

Substitute and solve for x:

• 7x - 9.1 = 60
• 7x = 69.1
• x = 69.1/7
• x = 9.9 (rounded)