|Calculate the area, circumference and diameter of Circle (Circle Calculator)|
r = radius
π = 3.14
Properties of a Circle:
Center - A point inside the circle. All points on the circle are equidistant (same distance) from the center point.
Radius - The radius is the distance from the center to any point on the circle. It is half the diameter. See Radius of a circle. Diameter - The distance across the circle. The length of any chord passing through the center. It is twice the radius. See Diameter of a circle.
Circumference - The circumference is the distance around the circle.
Examples: Find the area, diameter and circumference of a circle with the given radius 4.
Step 1: Find the area.
Area = πr² = 3.14 * 4² = 3.14 * 16 = 50.24
Step 2: Find the diameter.
Diameter = 2r = 2 *4 = 8
Step 3: Find the circumference.
Circumference = πd = 3.14 *8 = 25.12