05:16
How round is your circle?! www.howround.com
03:54
How do you measure the area of Yorkshire (www.howround.com)
03:40
How round is your circle?! (www.howround.com)
00:22
The super egg (www.howround.com)
00:18
The two-tip tetrahedron (www.howround.com)
00:30
The uni-stable polyhedron (www.howround.com)
00:31
Solids of constant width (www.howround.com)
00:52
Rolling ellipses (www.howround.com)
00:31
Rolling discs (www.howround.com)
00:21
Sarrus's linkage (www.howround.com)
00:23
Peaucellier's linkage (www.howround.com)
00:16
Two shapes which roll along together... (www.howround.com)
00:26
Dudeney's dissection (www.howround.com)
00:20
Peaucellier's linkage in an alternative form (www.howround.c
00:26
Chebyshev's linkage - alternative form (www.howround.com)
00:24
Hart's straight line (www.howround.com)
00:29
Hart's A-frame for drawing a straight line. (www.howround.co
00:29
Drilling a square hole! (www.howround.com)
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