Circle-set of all points in a plane that are the same distance from the same point called the center
Radius-distance from the center to any point on the circle
Circumference-the distance around a circle
Diameter-distance across the circle through the center, or twice the radius
Pi-the quotient of a circles diameter and circumference 3.14159...... which this constant is represented by the Greek letter pi
Step One: Write the Area formula
Step two: Substitute 3.14 for pi and substitute 2 for radius.
Step three: Multiply