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.
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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.
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Let's find the missing angle on this parallelogram
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Opposite angles are identical, so we know another 60 degree angle, and we know that there is another angle identical to our mystery angle
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For 4 sided shapes, the inside angles add up to 360
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So, our 2 mystery angles, plus 2 times 60, equals 360
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Twice our mystery angle is 240, so our mystery angle must be 120