Formulas: Area of a Circle

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Formulas: Area of a Circle

Learning about formulas will help you develop a strong foundation for your work in geometry. This video explains the formula for finding the area of a circle.

This video segment is from the GED Connection Formulas video.

A circle is a flat figure in which every point is the same distance from the center. A circle has no angles or sides, but we can still measure the surface area within it. When we find the area of a circle, we are attempting to find the number of square units we will need to cover the surface of the circle exactly. Although we cannot fit square units neatly within a circular area, we can use the formula Area = pi x radius² (A=πr²) to approximate the area.

Discussion Questions

In what sort of professions would you need to know the area of a circle? List as many as you can.
In everyday life, when would it be helpful for you to know how to calculate the area of a circle?
Look around the room. How many circles do you see?
Choose three circular objects in the room and, with a partner, calculate the area of each one.

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