Characteristics of a Circle

By | October 27, 2016

Parts of a Circle

In this tutorial students will learn about the characteristics of a circle. The students will be introduced to the following vocabulary words: chord, diameter, radius, center, circumference and pi. Lastly, the students will be introduced to their relationships between these characteristics.

A circle is a set of points that are equidistant from a specific point called the center.  A circle is named by its center.

A chord is a line segment that connects 2 points on the circle.

A diameter is a special chord that goes through the center of the circle and connects 2 points on the circle.

A radius is a line segment that connects with the center and a point on the circle.

Circumference is the distance around a circle.

Relationships

diameter = 2 * radius

radius = diameter/2 or (1/2)*diameter

circumference ≈ 3 * diameter

circumference / diameter ≈ 3 or 22/7

π = circumference / diameter

π = 3.1415926…

π is an irrational number

Fun Fact

The circumference divided by the diameter will ALWAYS equal pi, 3.1415926…