Angela owns a set of 6-inch tall glasses. each glass has a diameter of 3 inches. angela has three people over for dinner. each guest will be served a full glass of milk. how much milk will angela need (in cubic inches)? use 3.14 for pi ()

The volume of a cylinder is given by
  V = π·r²·h
A cylinder 3 inches in diameter and 18 inches tall will have a volume of
  V = π·(1.5 in)²(18 in) = 40.5π in³ ≈ 127.17 in³


The problem statement does not indicate that Angela will be serving herself, nor does it allow for some free space at the top of the full glass of milk.