Question

please answer these questions ​

Answer 1

Using Formula

${\large{\sf{\boxed{\green{Area = πr²}}}}}$

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$\sf{a. \: 28cm }$

$\sf\implies{ \frac{22}{7} \times 28 {}^{2} } \: \\ \sf\implies{ \frac{22}{7} \times 784 } \\ \sf\implies{22 \times 112 \: } \\ \sf\implies{2464cm {}^{2} } \:$

$\sf{b. \: 14cm }$

$\sf\implies{ \frac{22}{7} \times 14 {}^{2} } \\ \sf\implies{ \frac{22}{7} \times 196} \\ \sf\implies{22 \times 28} \: \: \: \\ \sf\implies{616cm {}^{2} } \: \: \:$

$\sf{c. \: \frac{7}{2} cm}$

$\sf\implies{ \frac{22}{7} \times (3.5) {}^{2} } \\ \sf\implies{ \frac{22}{7} \times 12.25} \\ \sf\implies{22 \times 1.75} \: \: \: \\ \sf\implies{38.5cm {}^{2} } \: \: \: \: \:$

$\sf{d. \: 42cm }$

$\sf\implies{ \frac{22}{7} \times (42) {}^{2} } \\ \sf\implies{\frac{22}{7} \times 1764} \:$

$\sf\implies{22 \times 252} \\ \sf\implies{5544cm {}^{2} } \:$