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

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So, it's not a rectangle : there are no right angles. If it's not a rectangle then it can't be a square either.

it has two pairs of same angles: that means that the opposite sides are parallel: this makes it a parallelogram.

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