Question

1. Which of these circles has the largest area?

a. A circle with radius 9 cm ​

Answer 1

Answer:

The formula for the circumference of a circle is =2 pi r The radius =9 cm circumference =2 pi r =2 xx 3.14 xx 9 =6.28 xx 9 =56.52cm.

Answer 2

Answer:

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

$value \: of \: \pi \: = \frac{22}{7}$

Then, the area of the Circle =

$2 \times \frac{22}{7} \times 9 = \frac{396}{7} cm = 56 \frac{4}{7}cm$