In this lesson, we will look at the formula used to calculate the area of a circle. You will learn it with the help of some
examples and practice questions with solution, and watching video as well as explanations
by the instructor.
You know from earlier learning that a circle is a set of points in a plane at the same distance from a point called the center. The radius of a circle is the distance from
the center to any point on the circle. The diameter, d of a circle is equal to twice the radius i.e.
d = 2r. If point A and point B are on the circle with center C, AB = AC = r = Radius
of the circle. To find the area of a circle you can use formula: Area =
r2.
For example, when a radius of a circle is 4 cm, its area is
x 42 i.e.
50.24 cm2.
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r2.
For example, when a radius of a circle is 4 cm, its area is