Calculate the circumference and area of the circle whose diameter = 14.

We have the diameter d =
14

Then the radius of the circle (r) = d/2 =
7

The circumference (C) =
2*r*pi

                                    =
2*7*22/7

                                     = 44
unit>

The area (a) =
Pi*r^2

                     =
(22/7)*(7^2)

                     =
22*7

                     = 154 square
unit.