Three semicircles and a circle with their centres. Two orange ellipses with focal points in the semicircle centres (they share the middle one). Prove that their upper intersection point coincides with the circle centre.

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geometry puzzles to train your brain

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- Post author By Rik
- Post date July 19, 2022
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- Post author By Rik
- Post date May 11, 2022
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A ladder seen from the side is sliding down a wall. Prove that a fixed point on the ladder traces part of an ellipse.