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

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Multiple Choice

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

Explanation:
Angles in a triangle add up to 180 degrees. With two angles known, you find the third by subtracting their sum from 180. Here, 40 plus 70 equals 110, and 180 minus 110 gives 70. So the third angle is 70 degrees. That also means the triangle has two equal angles, making it isosceles with the sides opposite those angles equal. The other options don’t fit because they don’t make the total 180: 40 + 70 + 50 = 160, 40 + 70 + 60 = 170, and 40 + 70 + 40 = 150.

Angles in a triangle add up to 180 degrees. With two angles known, you find the third by subtracting their sum from 180. Here, 40 plus 70 equals 110, and 180 minus 110 gives 70. So the third angle is 70 degrees. That also means the triangle has two equal angles, making it isosceles with the sides opposite those angles equal. The other options don’t fit because they don’t make the total 180: 40 + 70 + 50 = 160, 40 + 70 + 60 = 170, and 40 + 70 + 40 = 150.

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