In geometry, a chord is often used to describe a line segment joining two endpoints that lie on a circle. As you can see, a circle has many different radii and diameters, each passing through its center.Ī chord is a line segment that joins two points on a curve. A straight cut made from a point on the circle, continuing through its center to another point on the circle, is a diameter.
A radius is formed by making a straight cut from the center to a point on the circle. Look at the pizza to the right which has been sliced into 8 equal parts through its center. We can look at a pizza pie to find real-world examples of diameter and radius. Thus, the diameter of a circle is twice as long as the radius. If you place two radii end-to-end in a circle, you would have the same length as one diameter. The radius of a circle is the distance from the center of a circle to any point on the circle. A real-world example of diameter is a 9-inch plate. The distance across a circle through the center is called the diameter. Some real world examples of a circle are a wheel, a dinner plate and (the surface of) a coin. Thus, the circle to the right is called circle A since its center is at point A. We will also examine the relationship between the circle and the plane.Ī circle is a shape with all points the same distance from its center. Let's look at the definition of a circle and its parts. A circle is an important shape in the field of geometry.
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