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The circumference of a circle is …

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The circumference of a circle is 31.4 cm find the radius and the area of the circle take pi 3.14

Posted by Minu Choksi 6 years, 4 months ago

CBSE > Class 07 > Mathematics

1 answers

Sia ? 6 years, 4 months ago

Let the radius of the circle be r cm.
Circumference of the circle = 31.4 cm
{tex}\therefore{/tex} 2{tex}\pi r{/tex} = 31.4
{tex}\therefore{/tex} 2 {tex}\times{/tex} 3.14 {tex}\times{/tex} r = 31.4
{tex}\therefore{/tex} r = {tex}\frac{31.4}{2 \times 3.14}{/tex} = 5 cm
{tex}\therefore{/tex} Area of the circle = {tex}\pi r^2{/tex}
= 3.14 {tex}\times{/tex} 5² cm²
= 3.14 {tex}\times{/tex} 25 cm²
= 78.5 cm²

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Posted by Shree Vanshika Reddy Reddy 3 months, 1 week ago

CBSE > Class 07 > Mathematics