Hello there,
you need to know that diameter divided by 2 equals the radius.. so in this case.. the equation for the volume of a Cylinder is V= Pi R^2H
1) the radius would be 1.5 since we divided the 3 by 2
2) you plug it in...--> V=3.14×1.5^2×5.3
3) 3.14×3×5.3=49.926 which can be rounded to 50.
so the volume of the cylinder is 50cm3