Question

The surface area of a solid spherical ball of diameter $10cm$ is equal to :

• A. $25\pi {cm}^2$
• B. $50\pi {cm}^2$
• C. $100\pi {cm}^2$
• D. $200\pi {cm}^2$

Answer 1

The correct option is C $100\pi {cm}^2$

Given: Diameter of the sphere $=10cm$
Hence, Radius ($r$) of the sphere will be $5cm$
We know that,
Surface area of the sphere is $4\pi r^2$
Therefore, Area will be $4\pi (5{)}^2=100\pi {cm}^2$