Question

A sphere has a diameter of 7 centimeters. what is its surface area? use 3.14 to approximate pi. round to the nearest hundredth if necessary.

Answer 1

Sphere SA= 4*pi r^{2}

r= 3.5

pi =3.14

Sphere SA= 4*3.14*12.25

Sphere SA= 153.86

Answer 2

Answer:
`153.86\ cm^2`

Explanation:

The surface area of a sphere is given by :-

`\text{Surface area }=4\pi r^2`

Given: Diameter of sphere = 7 cm

then radius of sphere =
`(7)/(2)=3.5\ cm`

Therefore, the surface area of the given sphere will be :-

`\text{Surface area }=4(3.14) (3.5)^2\\\\\Rightarrow \text{Surface area }=153.86`

Hence, the surface area of the sphere =
`153.86\ cm^2`