Question

Find the surface area of a sphere having a radius of 4". 32 sq. in. 64 sq. in. 256/3 sq. in.

Answer 1

=4*pi*radius^2
=4(pi)(4^2)
=4(pi)(16)
=64(pi) sq inches

Answer 2

Option 2nd is correct

surface area(A) of a sphere is,
`64 \pi` square inches.

Explanation:

Surface area(A) of a sphere is given by:

`A = 4 \pi r^2` ......[1]

where, r is the radius of the sphere.

As per the statement:

Radius of the sphere(r) = 4 inch.

Substitute in [1] we have;

`A = 4 \pi \cdot (4)^2 =64 \pi` square inches.

Therefore, surface area(A) of a sphere is,
`64 \pi` square inches.