Diameter of sphere is 28 cm. Find out its surface area?

The correct answer is Option (1) → 2464 cm²

The surface area of a sphere of radius r is \(4\pi r^2\), four times the area of a circle of the same radius. The question gives the diameter, so the radius is found first.

• The radius is half the diameter: \(28\div2=14\) cm

• Surface area, with \(\pi=\frac{22}{7}\): \(\displaystyle =4\times\frac{22}{7}\times14\times14=88\times28=\) 2464 cm²