The angles of a quadrilateral measures 80 degrees 100 degrees 100 degrees in this order. What kind of quadrilateral has this shape? How do you know?

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asked Jan 7, 2016 218k views

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Annish · Answer 1 · 2016-01-12T16:34:22+0000

A parallelogram

Because...
-opposite angles are congruent
-four sides
-angles must equal 360
100 + 100 +80 + y = 360

280 + y = 360

y = 80
-the angle we don't know is 80 degrees

The angles of a quadrilateral measures 80 degrees 100 degrees 100 degrees in this order. What kind of quadrilateral has this shape? How do you know?

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