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Mathematics 19 Online
OpenStudy (anonymous):

An isosceles trapezoid is a quadrilateral with two congruent legs and a pair of parallel bases. Prove the base angles of an isosceles trapezoid are congruent.

OpenStudy (anonymous):

@SolomonZelman

Directrix (directrix):

@courter98 Look here for help: http://tinyurl.com/lh8gl4l

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