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.
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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.
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What is the missing angle here?
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Angles add in the same way that regular numbers do. Our mystery angle, alpha, and 30 add up to 90 degrees.
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That means that our myster angle, alpha, must be 30 less than 90, or 60 degrees.