Question

Find the area and the circumference of a circle with diameter 6 km

Answer 1

`C= 18.84 \ km`

`A = 28.26 \ km`

Explanation:

Circumference can be calculated using following formula

`C=2\pi r` ------------(1)

and area of circle can be calculated using following formula

`A= \pi r^(2)` ------------(2)

Here diameter d=6 km

Radius (r) is half of diameter

`r= (d)/(2) = (6)/(2) = 3 \ km`

Now calculate Circumference and diameter using equations (1) and (2) respectively

`C= 2\pi r = 2 (3.14) (3)\\C= 18.84 \ km`

`A= 3.14 (3)^2\\A= 28.26 \ km`