Euclid's Muse

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by Phil Todd

A lemma of Archimedes

BF is perpendicular to diameter CD.  E is the intersection point of tangents at B and D.  Observe that BG = FG. Can you prove it? This is from the Liber Assumptorum (Book of Lemmas) translated from Arabic but attributed to Archimedes.
by Saltire Team

Reflection Clock

You can reflect the triangle in the minute hand, then reflect the reflection in the second hand.  How long does it take to do a complete rotation? You can change the triangle by dragging the red points.  

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Welcome to Saltire Software’s app repository: Euclid’s Muse. This site features hundreds of free math apps created by our users. Upload, share and discuss your favorite apps created with Geometry Expressions. Join today and add to the collection.

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