Geometry, Theorems and Problems

Problem 233. Parallelogram, Exterior line, Perpendicular lines

The figure shows a parallelogram ABCD, A'C' is an exterior line. If a, b, c, and d are the perpendiculars drawn from A, B, C, and D to the line A'C', respectively, prove that: a + c = b + d. View or post a solution.
  

Problem 233: Parallelogram, Perpendicular lines 

 

 

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