Yrr79006

@yrr79006
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0:17
The mathematics of folding a piece of paper-B_rM_
7 years ago
0:18
How to draw a tangent to a circle from a point-WHym
7 years ago
0:44
How to draw a pentagon-xUvJhWlw
7 years ago
0:16
An introduction to waves-1Vbv7kA
7 years ago