Use the Triangle Angle Sum Theorem to find the measure of the third angle if the first and second angle measure 63°  and 40° .(1 point)

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1 answer

The sum of the angles in a triangle is always 180°.

Therefore, the measure of the third angle can be found by subtracting the sum of the first two angles from 180°:

180° - (63° + 40°) = 180° - 103° = 77°

So, the measure of the third angle is 77°.