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Find the area and circumference of a circular ground of radius is 21 cm.

1. 441π cm242π cm    
2. 512π cm2
3. 133π cm2
4. 442π cm2

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Correct Answer - Option 1 : 441π cm242π cm    


The radius of a circle is 21 cm.


Area of a circle = πr2

Circumference of a circle = 2πr

Where r = radius of a circle.


Area of the circle = πr2

So, Area would be π × 21 cm × 21 cm = 441π cm2

Circumference of a circle = 2πr

So, Circumference would be 2 × π × 21 cm = 42π cm               

∴ The area and the circumference of the circular ground are 441π cm2 and 42π cm respectively. 

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