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*urgent* Need Determine whether this quadrilateral must be a parallelogram

Urgent Need Determine Whether This Quadrilateral Must Be A Parallelogram class=

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0AIZEN0GO

Isn't that a parallelogram?

MKROOSKAGO
It must be a parallelogram because both sets of opposite angles are congruent and the sum of all angles equal 360°, meaning that both sets of opposite sides are parallel.

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