Question

find the area and circumference of the circle whose radius is 3.5 centimetre

Answer 1

22cm will be circumference,60.50cm sq.

Answer 2

Hi there !!

Given,

Radius of the circle = 3.5 cm
Writing it in the form of fraction,we have,

$\frac{35}{10} cm$
Reducing 35/10 to it's simpliest form , we have,

$radius \: = \frac{7}{2} cm$

We know,
Area of circle = πr²

$= \frac{22}{7} \times \frac{7}{2} \times \frac{7}{2} cm$

$\frac{77}{2} cm {}^{2}$
Area of circle = 38.5 cm

Circumference of a circle = 2πr

$= 2 \times \frac{22}{7} \times \frac{7}{2} cm$


= 22cm

Thus,

The area of the circle is 38.5cm² and it's circumference is 22cm