Question

If the diameter of a sphere is 20 cm. Find its curved surface area.​

Answer 1

Using the formulas

A=4πr2

d=2r

Solving forA

A=πd2

= π·202≈1256.63706cm²

Answer 2

Answer:

Curved Surface Area of Sphere =

= 8800/7 cm^2

= 1,257.14286 cm^2

Step-by-step explanation:

Given,

Diameter of sphere = d = 20 cm

Radius of sphere = r = d/2 = 20/2 = 10 cm

We know that,

Curved Surface Area of Sphere =

4π(r^2)

By applying the values in the formula, we get

C. S. A. = 4π(r^2)

C. S. A = 4 × 22/7 × 10 × 10 cm^2

C. S. A. = 8800/7 cm^2

C. S. A. = 1,257.14286 cm^2

Hence, Curved Surface Area of Sphere = 8800/7 cm^2

= 1,257.14286 cm^2