C. 68.8°
To find the measure of the third angle, we first add the measures of the two given angles:
39.5° + 61.7° = 101.2°
Then, we subtract the sum from 180° (which is the total sum of all angles in a triangle):
180° - 101.2° = 78.8°
Therefore, the measure of the third angle is 78.8°.
Two angles of a triangle measure 39.5° and 61.7°. Use the Triangle Angle Sum Theorum to find the measure of the third angle; do not round the answer.
A. 78°
B. 79°
C. 68.8°
D. 78.8°
1 answer
1 answer