Question

how to calculate the surface of wood outside of a sphere

Answer 1

Answer:

Hope it's correct thank you

Answer 2

Answer:

Step-by-step explanation:

Step 1: Know the radius of the sphere.

Step 2: Take the square of the radius by multiplying it by itself.

Step 3: Multiply r2 by 4.

Step 4: Multiply the value of 4r2 by the approximate value of pi, that is, 3.14.

Step 5: At last, add the units to the final answer.

Let us take an example to learn how to calculate the surface area of a sphere using its formula.

Example: Find the surface area of a spherical ball having a radius of 9 inches.

Solution: Given, The radius of the basketball is 9 inches

As we know, the surface area of sphere = 4πr2

r2 = 92= 81

Thus, surface area = 4πr2 = 4 × π × r2 = 4 × π × 81 = 1017.36

⇒ S = 1017.36 in2

∴ The surface area of the sphere is 1017.36 in2.