Question

Area of circle whose diameter is 21 is ...........................
346.5 sq.cm
37.68 sq.cm
18.84 sq.cm
19.84 sq.cm​

Answer 1

Answer:

$[/tex] <strong>Area of circle whose diameter is 21 is ...........................</strong></p><p><strong>346.5 sq.cm</strong></p><p><strong>37.68 sq.cm</strong></p><p><strong>18.84 sq.cm</strong></p><p><strong>19.84 sq.cm</strong></p><h3><u>Given</u></h3><p>Radius = 10.5 cm </p><p>Diameter = 21cm </p><p>[tex]area \: of \: the \: circle \: = {\pi} {r} ^{2}$

So,

$area \: = \: \frac{22}{7} \times 10.5 \times 10.5 \\ = {346.5 \: cm}^{2}$

So, the correct option is a)

Area of circle whose diameter is 21 is 346.5 sq.cm

Answer 2

Here is your answer :-

Diameter =21 cm

Radius =D/2

21/2

= 10.5

Area of the circle = πr^2

= 22/7 *10.5*10.5

= 346.5 sq.cm