Question 71482
The volume of a (right circular) cone is given by:
{{{V = (1/3)Ah}}} where A = the area of the circular base and h = the height of the cone (4m).
Let's find the area of the circular base whose diameter, D, is 2.2m.
Using 3.14 as an approximation of {{{(pi)}}}
{{{A = (pi)r^2}}} But the radius, {{{r = D/2}}}, so:
{{{A = (pi)(D/2)^2}}} 
{{{A = (3.14)(2.2/2)^2}}}
{{{A = (3.14)(1.21)}}}
{{{A = 3.8}}}sq. m.
Now you can calculate the volume using the initial formula {{{V = (1/3)Ah}}}
{{{V = (1/3)(3.8)(4)}}}
{{{V = 5.1}}} Cu. m. Rounded to nearest tenth.