Question

The surface "s" area of a sphere of radius " r" is given by the formula of s= 4πr^2

find;
1, the surface area of a sphere whose radius is 5 cm
2,the radius of a sphere whose surface area is 23716/81​

Answer 1

As below

Explanation:

1) 4*pi*
`5^(2)`= 314.159
`cm^(2)`

2) s = 4 * pi *
`r^(2)`

`√(s / (4*pi))` =r

`√((23716/81)/ (4 * pi))` = r

15.1643... = r :)