Question

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

Answer 1

Answer:

$C= 18.84 \ km$

$A = 28.26 \ km$

Step-by-step 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

$r= \frac{d}{2} = \frac{6}{2} = 3 \ km$

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

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

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