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Escherized Pentagons
Author:
John Golden
Despite being a pentagon with two kinds of rotations, this makes a pretty nice grid! Wish I could remember in which original Escher I found this symmetry.
GeoGebra
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The Red Chair
Question 6c
判斷錐體
apec
畫三角形
Discover Resources
Forum_f=62&t=39646_D_InitialGGB
外公切線
Start, Copy Segment
Parallelogram and Opposite Sides
Illustration of surface area of a sphere
四位數的位值