The volume of any sphere is (4/3) (pi) (sphere's radius)³ .
Number 3:
If that "6cm" in parentheses is the sphere's diameter, then its radius is 3cm,
and its volume is
(4/3) (pi) (27) = 36π cm³ .
If that "6cm" in parentheses is the sphere's radius, then its volume is
(4/3) (pi) (216) = 288π cm³ .
Number 4:
If that "28cm" in parentheses is the sphere's diameter, then
its radius is 14cm, and its volume is
(4/3) (pi) (2744) = 3,858π cm³ .
The best estimate is 11,500 cm³ .
If that "28cm" in parentheses is the sphere's radius, then its volume is
(4/3) (pi) (21,952) = 29,269-1/3 π cm³ .
The best estimate is 92,000 cm³ .