Surface Area Of A Sphere

 

sphere is a solid in which all the points on the round surface are equidistant from a fixed point, known as the center of the sphere. The distance from the center to the surface is the radius.

 

Surface area of a sphere is given by the formula

Surface Area of sphere = 4πr2

where r is the radius of the sphere.

DEMONSTRATION:

Calculate the surface area of a sphere with radius 2.2 cm

Solution:

Surface area of sphere 
= 4π r2 
= 4π (2.2)2
= 4 × 3.14 × 2.2 × 2.2 
= 60.79 cm2