Problems on Circumference

Introduction on Circumference:

Circles are simple closed curves which divide the plane into two regions, an interior and an exterior. In everyday use, the term "circle" may be used interchangeably to refer to either the boundary of the figure (also known as the perimeter) or to the whole figure including its interior.

Circumference of a Circle:

The diagrammatic representation showing circumference of circle is shown:

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The Circumference of a circle can be calculated using the following formula:

Circumference = 2 ╥ r or ╥ d

where r ----> radius of circle

d ----> diameter of circle , r = d/2

Example Problems for Finding Circumference of Circle:

Following is the sample Problem on Circumference

1) Find the Circumference of a circle with radius 20 cm. Use 22/7 as pi value.

Solution:

Circumference of a circle = 2 ╥r

= 2 (22/7) 20

= 2 (3.14) 20

= 125.6 cm