Question

Find the surface area of sphere of the radii 9 cm.​

Answer 1

TSA of sphere -----> 4Πr²

-------> 4 * 22/7 * (9)²

-------->4 *3.14 * 81

--------> 1017.36cm²

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Answer 2

Before, finding the answer. Let's find out how we can find the answer.

• In this question, we are asked to find the Surface Area of the Sphere with radii of 9 cm.
• So, to find the Surface Area of the Sphere, we must use the formula of :

$\boxed{ \sf Surface \: Area \: of \: Sphere = 4 \pi r^2}$

And here, we are taking,

π = $\sf \dfrac{22}{7}$

___________________________

Given :

• Radii = 9 cm

To find :

• Surface Area of Sphere

Solution :

Surface Area of Sphere = 4πr²

                                        = 4 × 22/7 × 9²

                                        = 4 × 22/7 × 81

                                        = 22/7 × 324

                                        = 22 × 324/7

                                        = 7128/7

                                        = 1018.28 cm²

Therefore, the Surface Area of Sphere is 1018.28 cm².