just compute the volume inside the metal and subtract it from the outside volume.
π/4 * 24^2 * 55 - π/4 * 20^2 * 51 = 2820π cm^3
A hollow cylinder open at both ends is made of steel 2 cm thick. What will be the volume of steel used in making the cylinder, if the external diameter is 24 cm and the length of the cylinder is 55 cm.
3 answers
If it is open at both ends, then the lengths are the same.
Volume of steel is obtained by subtracting the inner area from the outer area and multiplied by the length.
V=(π/4)(24²-20²)(55) cm³
= 2420π
Volume of steel is obtained by subtracting the inner area from the outer area and multiplied by the length.
V=(π/4)(24²-20²)(55) cm³
= 2420π
My bad - I missed the fact that it was open on the ends.