Answer:
[tex]C= 18.84 \ km[/tex]
[tex]A = 28.26 \ km[/tex]
Step-by-step explanation:
Circumference can be calculated using following formula
[tex]C=2\pi r[/tex] ------------(1)
and area of circle can be calculated using following formula
[tex]A= \pi r^{2}[/tex] ------------(2)
Here diameter d=6 km
Radius (r) is half of diameter
[tex]r= \frac{d}{2} = \frac{6}{2} = 3 \ km[/tex]
Now calculate Circumference and diameter using equations (1) and (2) respectively
[tex]C= 2\pi r = 2 (3.14) (3)\\C= 18.84 \ km[/tex]
[tex]A= 3.14 (3)^2\\A= 28.26 \ km[/tex]
