Find Out Things About Circles

Notes about circles:

• The radius R, or the distance from the center of a circle to its edge, is usually the defining property of a circle.

• The diameter, or the distance across a circle that passes through the center of the circle is 2R (twice the radius).

• The circumference, or distance around a circle is 2R.

• The area enclosed by a circle is R²

• Note that =3.1415926535...