# Area and perimeter of circle

## Area and Perimeter of a Circle - Geometry Calculator Math Antics - Circles, Circumference And Area

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If you want to fence a plot, how would you calculate how much fencing is required? Or if your parents want to put a new carpet in your room, how much carpet you need to buy? Going by the basic definition it is a closed plane geometric shape. Now getting into technical jargon a circle is a locus of a point moving in a plane, in such a way that its distance from a fixed point is always constant. In layman terms, a round shape is often referred to as a circle. Point seeking attention here is that the fixed distance is the radius of the circle. The radius of a circle has a major role for calculation of perimeter and area of circle and semi-circle.

If you're seeing this message, it means we're having trouble loading external resources on our website. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. Math Basic geometry Area and perimeter Area and circumference of circles. Labeling parts of a circle. Practice: Radius and diameter. Practice: Circumference of a circle. Relating circumference and area.

A triangle is any geometric object with three sides connecting to one another to form one cohesive shape. Triangles are commonly found in modern architecture, design, and carpentry, making the ability to determine the perimeter and area of a triangle centrally important. To best understand why a triangle is divided by two, consider that a triangle forms one half of a rectangle. A trapezoid is a flat shape with four straight sides with a pair of opposite parallel sides. Determining the surface area of a trapezoid is a bit more challenging.

## Relating circumference and area

Out of all the geometric shapes and figures, the circle is a fascinating form present around us. The pizza, coins, the sun are all circular in shape.

## Area of a circle

If you're seeing this message, it means we're having trouble loading external resources on our website. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. Math Basic geometry Area and perimeter Area and circumference of circles. Labeling parts of a circle. Practice: Radius and diameter. Practice: Circumference of a circle.

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## 3 thoughts on “Area and perimeter of circle”

1. Globintomzebr says:
2. Eustacio A. says:

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3. Anacleto B. says:

Perimeter is the distance around a closed figure and is typically measured in millimetres mm , centimetres cm , metres m and kilometres km.