he opposite sides of a quadrilateral are parallel. if one angle of the quadrilateral is 120degree. find the other angles
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if the opposite sides of a quadrilateral are parallel then it is an parallelogram.
opposite angles of a parallelogram are congruent. the second angle is 120°.
240°+ x + x = 360°
2 x = 120°
x = 60°
therefore the third and fourth angles are equal to 60°.
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