Two angles of a triangle measure 39.5°
and 61.7°
. Use the Triangle Angle Sum Theorem to find the measure of the third angle; do not round the answer.(1 point)
Responses
78°
78 degrees
78.8°
78.8 degrees
79°
79 degrees
68.8°
The correct answer is 78.8°.
Since the sum of all three angles in a triangle is always 180°, you can find the measure of the third angle 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°.