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QuizMultiple Choice

Sum of Interior Angles of a Triangle

Question 1 • *Integrated Math II Full

The measure of one interior angle of a triangle is 45°. What can you conclude about the other two interior angles of the triangle?

Answer
A
One of the other angles must be a right angle.
B
The sum of the measures of the other two angles is 135°.
C
The other two angles must be acute angles.
D
One of the other angles must have a measure greater than 90°.

Explanation

The interior angles of a triangle add up to 180°. Since one angle is 45°, the other two angles together measure 180° − 45° = 135°. So the correct conclusion is that their sum is 135°; they do not have to be any particular combination of angles.

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