Volume of a sphere
We know that the volume of a sphere is given by the following equation:
where π and r are numbers: π is pi and r is the radius.
Since
π = 3.14
and
r = 2.8 cm, then
![\begin{gathered} Volume=(4)/(3)\pi r^3 \\ \downarrow \\ Volume=(4)/(3)\cdot3.14\cdot(2.8\operatorname{cm})^3 \end{gathered}]()
Since
(2.8 cm)³ = 21.952 cm³,
![\begin{gathered} Volume=(4)/(3)\cdot3.14\cdot(2.8\operatorname{cm})^3 \\ \downarrow \\ Volume=(4)/(3)\cdot3.14\cdot21.952\operatorname{cm}^3 \\ \downarrow \\ Volume=91.9\operatorname{cm}^3 \end{gathered}]()
Since 91.9 is very near to 92, then
91.9 cm³ ≅ 92 cm³
Answer: C. 92 cm³