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Find the missing angle on the parallelogram

This math skill teaches how to find a missing angle in a parallelogram by using the properties that opposite angles are equal and the sum of all angles in a quadrilateral is 360 degrees.

Learn find the missing angle on the parallelogram

Teaching Transcript

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Let's find the missing angle on this parallelogram

Opposite angles are identical, so we know another 60 degree angle, and we know that there is another angle identical to our mystery angle

For 4 sided shapes, the inside angles add up to 360

So, our 2 mystery angles, plus 2 times 60, equals 360

Twice our mystery angle is 240, so our mystery angle must be 120

Skill Practice

Find the missing angle on the parallelogram

Test your understanding of find the missing angle on the parallelogram by practicing it! Work through the below exercises to use it in practice.