Two angles of a triangle measure 39.5° and 61.7°. Using the Triangle Angle Sum Theorem, which states that the sum of the inside angles of all triangles must equal 180°, find the measure of the third angle. (2 points)
Responses
A. 68.8°
68.8°
B. 78.8°
78.8°
C. 88.8°
88.8°
D. 98.8°
The measure of the third angle is found by subtracting the sum of the two given angles from 180°:
180° - (39.5° + 61.7°) = 78.8°.
Therefore, the measure of the third angle is 78.8°.
Correct Response: B. 78.8°