Question

find area of circle whose diametar is 200cm​

Answer 1

Answer:

area of a circle = pi r square.

here r=100cm

so area =3.14x100x100

=31400cm square

Answer 2

Answer:

Area of circle =

$\pi \: r {}^{2}$

Step-by-step explanation:

here we know,

$r = \frac{d}{2} \\ \: \: \: = \frac{200}{2} \\ \: \: \: = 100$

$area \: of \: circle \: = \pi \: r {}^{2} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{22}{7} \times (100) {}^{2} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{22}{7} \times 10000 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 31428.57$

therefore the answer is

area of circle is 31428.57 cm2