Question

HELLPP PLEASE. 100 POINTS!

Answer 1

∠A = 80°

Explanation:

The sum of two interior angles in a triangle is equal to an exterior angle that is supplementary to the third interior angle.

We can write the following equation based on the above mentioned information to find the value of angle A:

2x + 40 = 3x

• Transfer like terms to the same side of the equation

40 = 3x - 2x

• Do the subtraction

40 = x

Replace x with 40

2*40 = 80