Geometry: Area of a Circle
This is a free lesson from our course in Geometry 
 
   
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.
<h2> Area of a Circle - Watch video (Geometry)</h2> <p> area, circle, set, geometry, point, learning, area of a circle, video, distance, center of a circle, diameter of a circle, formula center, explaination, diameter, line segment, practice questions, quizzes</p> <p> 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.</p>
Other useful lessons:
Area of a Rectangle
Area of a Square
Area of a Triangle - Areas of Polygons and Circles
Area of a Rhombus
Area of a Parallelogram
Area of a Trapezoid
Effect of dimension changes on Area
Real World Applications - Area of Polygons and Circles
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