Question

What is m∠A?Enter your answer in the box.m∠A = ______

Answer 1

The three inside angles of a triangle equal 180 degrees.

All the 3 given angles together to equal 180 to solve for x, then calculate angle A.

x + (x-8) +(3x+13) = 180

Simplify the left side by combing like terms:

5x +5 = 180

Subtract 5 from each side:

5x = 175

Divide both sides by 5:

x = 175/5

x = 35

Now x is known, replace x in the equation for angle A:

3x+13 =

3(35) +13 =

105+13 = 118

Angle A = 118 degrees.