Question

Find the volume of a cylinder with a diameter of 8 inches and a height that is three times the radius. Use 3.14 for pi and round your answer to the nearest hundredth. (Hint: You may only enter numerals, decimal points, and negative signs in the answer blank)

Answer 1

Do the volume of a circle then multiply by the length of the cylinder
area of a circle = $\pi r^2$
diameter/2 = radius
so 4^2 = 16   16*3.14 = 50.24
50.24*(4*3) = 50.24*12 = 602.88

Answer 2

Answer:

602.88 sq in

Step-by-step explanation:

The formula for the volume of a cone is

V = πr²h

The diameter is 8; since the radius is half of the diameter, this makes the radius 8/2 = 4.

This gives us

V = 3.14(4²)h

We know the height is three times the radius this makes it 4(3) = 12:

V = 3.14(4²)(12) = 602.88