Differences

This shows you the differences between two versions of the page.

--- urp:circles [2021-10-17]
nerf_herder
+++ urp:circles [2021-11-19]
nerf_herder
@@ Line 4: / Line 4: @@
   * __secant__ is a line that contains a chord, but extends beyond the circle
   * __tangent__ is a line that touches a circle at one point (a secant with chord length of zero)
-  * __Intercepted arc__ is the part of the circle contained within the two lines, it has 1/2 the degrees of the intercepted arc
+  * __Intercepted arc__ is the part of the circle contained within the two lines
   * __Central angle__ is angle of two lines from the center of the circle, it has the same degrees as the intercepted arc
-  * __Inscribed/Interior angle__ has two points and the vertex all on the circle itself
+  * __Inscribed/Interior angle__ has two points and the vertex all on the circle itself, it has 1/2 the degrees of the intercepted arc
 In the image, P is center point of the circle, line C is a chord and line S is a secant.
@@ Line 26: / Line 26: @@
                       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).
+-------
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