In a triangle, if two angles are 40 degrees and 70 degrees, what is the measure of the third angle?

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Multiple Choice

In a triangle, if two angles are 40 degrees and 70 degrees, what is the measure of the third angle?

Explanation:
The angles in a triangle always add up to 180 degrees. With two angles measuring 40 degrees and 70 degrees, the third angle must make the total 180: 180 − (40 + 70) = 70 degrees. So the third angle is 70 degrees, giving angles of 40, 70, and 70 which do sum to 180. The other values wouldn’t make the total 180 (for example, 40 would give 150, 60 would give 170, and 80 would give 190).

The angles in a triangle always add up to 180 degrees. With two angles measuring 40 degrees and 70 degrees, the third angle must make the total 180: 180 − (40 + 70) = 70 degrees. So the third angle is 70 degrees, giving angles of 40, 70, and 70 which do sum to 180. The other values wouldn’t make the total 180 (for example, 40 would give 150, 60 would give 170, and 80 would give 190).

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