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This tutorial will show you how to find the circumference when given the radius.   You will learn the relationship between the diameter and the radius.  It is important to take note that we need to replace the diameter in the formula and not the radius, so we need to take the measurement for the radius and figure out the diameter in order to solve for the circumference.

Circles are simple shapes of Euclidean geometry. A circle consists of those points in a plane which are at a constant distance, called the radius, from a fixed point, called the center.

A chord of a circle is a line segment whose both endpoints lie on the circle. A diameter is a chord passing through the center. The length of a diameter is twice the radius. A diameter is the largest chord in a circle.

Circles are simple closed curves which divide the plane into an interior and an exterior. The circumference of a circle is the perimeter of the circle, and the interior of the circle is called a disk. An arc is any connected part of a circle.

A circle is a special ellipse in which the two foci are coincident. Circles are conic sections attained when a right circular cone is intersected with a plane perpendicular to the axis of the cone.

The circumference is the distance around a closed curve. Circumference is a kind of perimeter.

How many legs in total do a chicken, and a sheep have?