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)
The Triangle Angle Sum Theorem states that the sum of the measures of the angles in a triangle is 180°.
Let the measure of the third angle be x°.
According to the Triangle Angle Sum Theorem, we can write the equation as follows:
63° + 40° + x° = 180°
Simplifying the equation:
103° + x° = 180°
Subtracting 103° from both sides:
x° = 180° - 103°
Therefore, the measure of the third angle is:
x° = 77°