What kind of angle measures less than 90 degrees?

Prepare for the MSTEP 3rd Grade Math Test with interactive quizzes and multiple-choice questions. Get essential hints and in-depth explanations to excel in your exam!

Multiple Choice

What kind of angle measures less than 90 degrees?

Explanation:
Angles are described by how wide they open. When an angle opens less than a right angle, it’s called acute. That means it’s smaller than 90 degrees, which is exactly what the question is asking for. For reference, an obtuse angle opens wider than a right angle (more than 90 degrees but less than 180), a straight angle is a straight line at 180 degrees, and a right angle is exactly 90 degrees. So the type that measures less than 90 degrees is an acute angle.

Angles are described by how wide they open. When an angle opens less than a right angle, it’s called acute. That means it’s smaller than 90 degrees, which is exactly what the question is asking for. For reference, an obtuse angle opens wider than a right angle (more than 90 degrees but less than 180), a straight angle is a straight line at 180 degrees, and a right angle is exactly 90 degrees. So the type that measures less than 90 degrees is an acute angle.

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