Question

The perimeter of a circle=πr², where π=22/7. find the area of r=21cm
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Answer 1

EXPLAINATION:  $\pi r^2=\frac{22}{7} .21^2=\frac{22}{7} .441=\frac{22.441}{7} =\frac{22.63.7}{7} =22.63=1386<cm^2>$  

ANSWER: 1386 $cm^2$

Ok done. Thank to me :>