Question

The surface area of sphere when its diameter is 4 cm is *​

Answer 1

Answer:

A≈50.27

Step-by-step explanation:

The Greek mathematician Archimedes discovered that the surface area of a sphere is the same as the lateral surface area of a cylinder having the same radius as the sphere and a height the length of the diameter of the sphere.

The lateral surface area of the cylinder is 2πrh where h=2r .

Lateral Surface Area of the Cylinder =2πr(2r)=4πr2 .

Therefore, the Surface Area of a Sphere with radius r equals 4πr2 .

Answer 2

Step-by-step explanation:

diameter=4cm

radius =2cm

surface area of sphere=4πr2

=4πr2

=4*22/7*2*2

=352/7

=50.27cm2

hope this helped!!