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Rov90212
@rov90212
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0:17
Key pad electronics demo-qUOaYACZm
7 years ago
0:41
How to draw a tangent to a circle from a point-WHym_
7 years ago
0:26
How to draw a pentagon-xUvJ
7 years ago
0:19
The mathematics of folding a piece of paper-B_rM_c4
7 years ago