A triangle has two angles of 45 degrees; what is the third angle?

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Multiple Choice

A triangle has two angles of 45 degrees; what is the third angle?

Explanation:
The essential rule here is that the angles in a triangle add up to 180 degrees. With two angles of 45 degrees each, they sum to 90 degrees, leaving the third angle as 180 − 90 = 90 degrees. That makes the triangle a right triangle (a 45-45-90 triangle). The other candidate values wouldn’t bring the total to 180—for example, 60 would give 150, 45 would give 135, and 135 would give 225.

The essential rule here is that the angles in a triangle add up to 180 degrees. With two angles of 45 degrees each, they sum to 90 degrees, leaving the third angle as 180 − 90 = 90 degrees. That makes the triangle a right triangle (a 45-45-90 triangle). The other candidate values wouldn’t bring the total to 180—for example, 60 would give 150, 45 would give 135, and 135 would give 225.

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