A circle that passes through all vertices (corner points) of a polygon.
Triangles, rectangles, regular polygons and some other shapes have an incircle, but not all polygons.
A regular polygon's radius is also the radius of the circumcircle.
Below is the circumcircle of a triangle (try dragging the points):
Triangles, rectangles, regular polygons and some other shapes have an incircle, but not all polygons.
A regular polygon's radius is also the radius of the circumcircle.
Below is the circumcircle of a triangle (try dragging the points):
Copyright © 2018 MathsIsFun.com