Question

Define the surface area of a sphere of radius 'a'.​

Answer 1

Answer:

The surface area of a sphere is defined as the region covered by its outer surface. A Sphere is a three-dimensional solid object having a round structure, just like a circle. The difference between a sphere and a circle is that a circle is in 2-dimension, whereas, a sphere is a 3-dimensional shape.

From a visual perspective, it has a three-dimensional structure that forms by rotating a disc that is circular with one of the diagonals. Let us consider an instance where spherical ball faces are painted. To paint the whole surface, the paint quantity required has to be known beforehand. Hence, the area of every face has to be known to calculate the paint quantity for painting the same. We define this term as the total surface area. The surface area of a sphere is equal to the areas of the entire face surrounding it.

Surface Area of a Sphere

Surface Area of a Sphere Formula

The surface area of a sphere formula is given by,

A = 4 π r2 square units