The Triangle Angle Sum Theorem states that the sum of the angles inside a triangle must equal 180°. Using this theorem, find the measure of angle C.
Since the sum of the angles in a triangle must equal 180°, we can set up the equation:
Angle A + Angle B + Angle C = 180°
We know that Angle A is 45° and Angle B is 70°. Substituting these values in, we get:
45° + 70° + Angle C = 180°
Combining the known angles, we have:
115° + Angle C = 180°
Now, we can isolate Angle C by subtracting 115° from both sides of the equation:
Angle C = 180° - 115°
Angle C = 65°
Therefore, the measure of angle C is 65°.