Geometry Supplement for Math 60 – Perimeter, Area, and …

The diameter of a circle is a line segment through the center in which its endpoints lie on the circle. Note: d = 2r. Circumference of a circle. C = d or C = 2 r . The perimeter of a circle is called its circumference. The circumference of a circle is just over three times the length of the diameter. ................
................