I don’t know how to do this problem cylinder b part that you see in the photo

Answer:
58.875
Step-by-step explanation:
the formula for finding the volume of a cylinder is as stated:
V=πr²h
in the problem in gives you diameter not the radius. 5 divided by 2 is 2.5. so you would write into your calculator- 3.14 × 2.5² × 3, giving you 58.875.
hope this helped :)