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.
C°
25°
(2 points)
• 155°
О 205°
•65°
The sum of the angles inside a triangle must equal 180°.
Angle C is 25° and the other two angles are 155° and 65°.
Therefore, the measure of angle C is:
180° - 155° - 65° = 180° - 220° = -40°
However, since angles cannot be negative, we can just add 360°:
-40° + 360° = 320°
Therefore, the measure of angle C is 320°.