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urp:circles
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| Both sides previous revision Previous revision Next revision | Previous revision | ||
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urp:circles [2021-10-17] nerf_herder |
urp:circles [2021-11-19] (current) nerf_herder |
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| so a = (rad/2π)*(πr²) | so a = (rad/2π)*(πr²) | ||
| + | **length of arc**, given length of chord and radius: | ||
| + | d = 2*r*sin(a/2r) | ||
| + | a = length of arc, d = length of chord, r = radius | ||
| + | |||
| + | **circumcircle** - a circle that touches the vertices of an polygon | ||
| + | circumcircle of a triangle - has the center at the point where the | ||
| + | perpendicular bisectors of the triangle's sides meet. | ||
| + | (might be outside the triangle). | ||
| + | To find the radius: https://mathworld.wolfram.com/Circumradius.html | ||
| + | |||
| + | ------- | ||
| Back to [[geometry]] or [[math]] page. | Back to [[geometry]] or [[math]] page. | ||
urp/circles.1634509640.txt.gz · Last modified: 2021-10-17 by nerf_herder
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