A regular decagon and triangles from vertices and side midpoints. What fraction is red?

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geometry puzzles

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- Post author By Rik D. Tangerman
- Post date January 15, 2024
- No Comments on Bandaged head

A regular decagon and triangles from vertices and side midpoints. What fraction is red?

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- Post author By Marshall W. Buck
- Post date August 10, 2023
- 1 Comment on The pentangle flower

Multicoloured pentangle in a red circle. Rhombuses form two levels of petals growing outward, forming a decagon. Show that the opposite sides of the two interleaved pentagons are equal in pairs and also equal and parallel to the sides of the pentangle.