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

Answer:

As below

Step-by-step explanation:

1)    4*pi*$5^{2}$= 314.159 $cm^{2}$

2)    s = 4 * pi *$r^{2}$

$\sqrt{s / (4*pi)}$ =r

$\sqrt{(23716/81)/ (4 * pi)}$ = r

15.1643... = r   :)