Geometry, Theorems and Problems

Problem 232. Parallelogram, Line through a vertex, Perpendicular lines

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

Elearn 231: Parallelogram, Perpendicular lines 

 

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