How to find the circumference and area of a circle

To find the circumference of a circle, you have to follow this method:

circumference=pi*d (diameter)

value of pi is 3.14 rounded, but in questions they'll tell you the value mostly as

'use pi=something', in here we'll use 3.14.

question - diameter of a circle is 3cm. what's it's circumference.

c=3.14*3 = 9.42cm (answer)

to find the area of a circle:

area=pi * radius squared

question - the radius of a circle is 2cm. what's it's area?

a=3.14*2squared

a=12.56cm2 (answer)

hope you will understand