Question

the volume of a sphere (v) is directly proportional to the cube of it's radius (r).​

Answer 1

Answer:

Step-by-step explanation:

Vol do r^3

V = kr^3

Note well: k is constant of proportionality

4/3πr^3 = kr^3

Divide both sides by r^3 to obtain the value of k

K= 4/3πr^3 ÷ r^3

r^3 cancel out r^3

Therefore k = 4π/3