If two interior angles measure 85 degrees and 40 degrees, what is the measure of the third angle?

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Multiple Choice

If two interior angles measure 85 degrees and 40 degrees, what is the measure of the third angle?

Explanation:
In a triangle, the interior angles add up to 180 degrees. The two given angles sum to 85 + 40 = 125 degrees, so the remaining angle must make the total 180. That gives 180 − 125 = 55 degrees. So the third angle measures 55 degrees. The other sums would not reach 180, so they aren’t possible for a triangle.

In a triangle, the interior angles add up to 180 degrees. The two given angles sum to 85 + 40 = 125 degrees, so the remaining angle must make the total 180. That gives 180 − 125 = 55 degrees. So the third angle measures 55 degrees. The other sums would not reach 180, so they aren’t possible for a triangle.

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