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A parallelogram has 2 sets of equal sides.That means that there are 2 sets of the same angles.If one angle is 100 degrees,the angle diagonal of it is also 100 degrees.So as long as you know one angle you can calculate the rest since all the angles have to add up to 360 degrees.So if there are three unknown angles but one is 100 degrees.One of the unknown angles is also 100 degrees.And since that equals to 200 degrees,minus 360 by 200 and you get 160 which is the combined degrees of the last two angles which are the same.So the last two angles are both 80 degrees.

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Q: How do you find out the value of x on a parallelogram?
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