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.
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
Winpossible's online math courses and tutorials have gained rapidly popularity since their launch in 2008. Over 100,000 students have benefited from Winpossible's courses... these courses in conjunction with free unlimited homework help serve as a very effective math-tutor for our students.
 - All of the Winpossible math tutorials have been designed by top-notch instructors and offer a comprehensive and rigorous math review of that topic. - We guarantee that any student who studies with Winpossible, will get a firm grasp of the associated problem-solving techniques. Each course has our instructors providing step-by-step solutions to a wide variety of problems, completely demystifying the problem-solving process! - Winpossible courses have been used by students for help with homework and by homeschoolers. - Several teachers use Winpossible courses at schools as a supplement for in-class instruction. They also use our course structure to develop course worksheets.

 Copyright © Winpossible, 2010 - 2011 Best viewed in 1024x768 & IE 5.0 or later version