EQUATIONS OF SCIENCE |
LESSON 2. Equations with no End
The Circle and the Pi (B) The circle goes back before recorded history with the discovery of the wheel. Circles are closed curves that are equidistant from a fixed point called the center. The circumference (c) is the outside perimeter of a circle. If you draw a line through the center it is called the diameter (d). The center to the edge it is called the radius (r) or half the diameter (1/2d). A circle is a highly symmetrical shape. |