Question

if the radius is 21cm find its area

Answer 1

Area of circle = pie r2

22/7×21×21 = 1386 cm^2

Answer 2

$area \: of \: circle = \pi {r}^{2}$

Radius is given as 21cm

$area = \pi {21}^{2}$

$\: \: \: \: = \pi441 \\ </em><em>consider \: \pi \: as \: \frac{22}{7}$

$\: \: \: \: = \frac{22}{7} \times 441$

$\: \: \: \: = 22 \times 63$

$\: \: \: \: = 1386$

$hence \: area \: of \: circle \: is \: 1386 {</em><em>c</em><em>m}^{2}$

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