Question

Rajesh is working out the area of a circle with radius 10.
He writes:
Area = 3.142 x 20
Explain why Rajesh's working is wrong

Answer 1

Hope this will help....

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Answer 2

$Given \:radius \:of \: a \: circle (r) = 10\:cm$

$\blue { Area \:of \:the \:circle (A)} = \pi r^{2} \\= 3.142 \times (10)^{2} \: [Since, \pi = 3.142 ] \\= 3.142 \times 10^{2} \: square \:units$

$\pink { Perimeter \:of \: the \: Circle (P) } \\= 2\pi r \\= 2 \times 3.142 \times 10 \\= 3.142 \times 20 \: units$

$Here, Rajesh's \: worked \: out \: perimeter \\instead \: of \: Area$

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