Question

The sum of the measures of angles 2 and 3 is equal to the measure of ? .

Answer 1

∠1

Explanation:

The external angle of a triangle is equal to the sum of the 2 opposite interior angles.

∠1 is an exterior angle and ∠' s 2 and 3 are the opposite interior angles.

Hence

∠2 + ∠3 = ∠1