Question

Which two equations relate the measure of ∠4, to the measures of ∠1, ∠2, and/or ∠3.

Answer 1

A and C

Explanation:

The sum of two interior angles in a triangle is equal to an exterior angle that is supplementary to the third interior angle so first option,

A. m∠4 = m∠1 + m∠2

is correct.

m∠3 and m∠4 are supplementary angles because they make a straight line and their sum is equal 180°, so third option,

C. m∠4 = 180 - m∠3

is also correct.