[أحمد سعد الدين]

Problem 161
Parallelogram, Midpoints, Octagon, Areas
http://www.gogeometry.com/problem/p1...tagon_area.htm






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[أحمد سعد الدين]

Problem 215.
Quadrilateral, Angle Bisectors, and Cyclic Quadrilateral




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[أحمد سعد الدين]

Problem 43. Angles, Triangle. Level: High School, SAT Prep, College
In the figure, AB = BC = CD, and the measure of angle C is double the measure of angle A. Prove that x = 60°.



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[أحمد سعد الدين]

Problem 40. Triangle, Incenter, Excenter. Level: High School, SAT Prep, College
In triangle ABC, the angles A and B measure 80 and 40 respectively, I is the incenter and E the excenter. AB and CE meet at D. If BC = a, AC = b and CI = d, prove that ..



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[أحمد سعد الدين]

تمرين رقم (229)




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[أحمد سعد الدين]

تمرين رقم (230)




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[أحمد سعد الدين]

تمرين رقم ( 231 )



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