quadrilateral with orthogonal diagonas

Author:benedict heal

Given a quadrilateral whose diagonals are perpendicular, the reflections in each side of the point of intersection of the diagonals form a cyclic quadrilateral.

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Rovnoběžnost rovin
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Congruent Figures
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繪畫垂直線

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Pedro's String (1)
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Pantulan
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Pythagoras or Pythagorean Theorem
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Similarity Transformation or Similarity