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Geometry Problem 955: Quadrilateral, Triangle, Diagonals, Angles, 30, 40, 60, 70 Degrees. Level: School, College, Mathematics Education

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In a quadrilateral ABCD diagonals meet at E (figure below). If the measure of the angles BAD, CBD, ADB, and BDC are  60, 30, 40, and 70 degrees, respectively, find the measure of angle CED.
Try to you use elementary geometry (Euclid's Elements).
 
 

Geometry Problem 955: Quadrilateral, Triangle, Diagonals, Triangle, Angles, 30, 40, 60, 70 Degrees

 

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