Use the Triangle Angle Sum Theorem to find the measure of the third angle if the first and second angle measure 63° and 40°. (1 point)

Answer 1

The sum of the measures of the angles in a triangle is always 180°.

Let's label the third angle as x.

Therefore, using the Triangle Angle Sum Theorem, we can write the equation as follows:

63° + 40° + x = 180°

Combining like terms:

103° + x = 180°

Then, we can subtract 103° from both sides:

x = 180° - 103°

Simplifying:

x = 77°

Therefore, the measure of the third angle is 77°.