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Czj31689
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0:26
How to draw a pentagon-xUvJhWlwp
7 years ago
0:44
How to draw a tangent to a circle from a point-WHym_d8Q
7 years ago
0:41
The mathematics of folding a piece of paper-B_rM_c4
7 years ago
0:34
Key pad electronics demo-qUOaYACZm
7 years ago