Question

If radius of circle is 21 CM. Find the area of circle

Answer 1

Answer:

1385.44CM

Step-by-step explanation:

Formula:

Area of circle = πr²

= 3.14 x (21)² (π = 3.14)

= 3.14 x 441 (21² = 441)

= 1385.44CM

Answer 2

Step-by-step explanation:

Given that

Radius of circle is 21cm

To find

Area of circle

Solution

$area \: of \: Circle = \pi \times {r}^{2} \\ = \frac{22}{7} \times (21 {)}^{2} \\ =\frac{22}{7} \times 21\times 21\\=22\times 3\times 21= 1386 {cm}^{2}$

Hence area of circle is 1386 cm sq.