Go Geometry Problem Problem 1327: Two Squares Side by Side, Perpendicular, 90 Degrees, Angle.

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The figure below shows the squares ABCD and DEFG (E on CD). Prove that AE and CG are perpendicular.
 

Geometry Problem 1327: Two Squares Side by Side, Perpendicular, 90 Degrees, Angle.

See also:
Art of problem 1312


 

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