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Orthocenter of a Triangle

Author:Kurt Hoelsema

Topic:Orthocenter

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Untitled
Triangle with 3 Right Angles
Reflection across a line
bewijs stelling van Pythagoras
Reflection Across 2 Parallel Lines

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Projectile Motion - Friendly Balls
Finish Draft 2.2
Challenge 2 Task 1
Dodecagon Puzzle
Construction 3 of Vertically Opposite Angles

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Reflection
Similarity Transformation or Similarity
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Trigonometry
Line Segment

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