
Actually Welcome to the concept of Surface Areas and Volume.
==> Volume of Cylinder = πr^2h
==> 27π = πr^2(3)
==> 27 = r^2 (3)
==> r^2 = 9
==> r = 3 inch
hence the radius is 3 inches.
Answer:
x = 29.7 or 29.69848480
Step-by-step explanation:
Use the formula a² + b² = c²
21² = 441
20² = 400
400 + 441 = 882
√882 = 29.7
You square the number at the end to cancel out the squared number, since both 21 and 20 aren't originally squared.