What is m∠abc? the measure of angle abc = 60 degrees the measure of angle abc = 15 degrees the measure of angle abc = 45 degrees the measure of angle abc =75 degrees.

The measure of angle ABC is 60 degrees

Step-by-step explanation:

Let

x -----> the measure of angle ABC

we know that

The measure of an exterior angle of a triangle is equal to the sum of the measures of the two non-adjacent interior angles

so

In this problem

Solve for x

Subtract 75 both sides

therefore

The measure of angle ABC is 60°

d

step-by-step explanation:

d