Find the surface area of a sphere whose diameter is equal to 18 cm.

Correct option is B

Given:

Diameter of sphere = 18cm

Formula Used:

Total surface area = $$4\pi r^2$$​​

Solution:

Radius of sphere = $$\frac{18}{2}$$ = 9cm

Total surface area = $$4 \pi (9)^2$$​

​$$= 4 \times \pi \times 81$$​​

​$$= 324\pi \ cm^2$$​​