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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. |