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16 September, 09:13

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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  1. 16 September, 09:20
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    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
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