Use the Triangle Angle Sum Theorem to find the measure of the third angle if the first and second angle measure 63°

Question

and 40°
.(1 point)

Answer 1

The Triangle Angle Sum Theorem states that the sum of the angles in a triangle is 180 degrees.

Therefore, to find the measure of the third angle, we can subtract the sum of the measures of the first and second angles from 180 degrees:

Third angle measure = 180 degrees - (63 degrees + 40 degrees)
Third angle measure = 180 degrees - 103 degrees
Third angle measure = 77 degrees

So the measure of the third angle is 77 degrees.