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Finding the remainder of a 90 degree angle

This skill teaches how to find the missing angle in a 90-degree scenario by using the principle that angles sum up like regular numbers. To determine the missing angle, subtract the sum of known angles from 90 degrees.

Learn finding the remainder of a 90 degree angle

Teaching Transcript

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What is the missing angle here?

Angles add in the same way that regular numbers do. Our mystery angle, alpha, and 30 add up to 90 degrees.

That means that our myster angle, alpha, must be 30 less than 90, or 60 degrees.

Skill Practice

Finding the remainder of a 90 degree angle

Test your understanding of finding the remainder of a 90 degree angle by practicing it! Work through the below exercises to use it in practice.