Aglass jar is shaped like a cylinder. the jar for a height of 8 in. and a base with a diameter of 4in. there are 3 in. of grape jelly left in the jar. what is the volume of the jelly in the jar?

It doesn't really matter that the jar is 8 inches high.  What matters is how high the jelly is (3 inches), so the height that matters is 3 inches.  The diameter of the jar is 4 inches.  We need to know the radius of the circle in order to find out the area of the circle, so divide the diameter in half.  So half of 4 inches is 2 inches, which is the radius.  Use the formula where the volume is equal to pi times the radius squared times the height:

 Volume = 3.14 *( 2)^ 2 * 3     Square the 2 first

Volume = 3.14 * 4 * 3             Multiply by 3

Volume = 3.14 * 12                Then multiply by pi (3.14)

Volume = 37.68

(If you round it to more than the hundredth for pi, like 3.14159, then your answer would be 37.69908)

(If you use 3.141592653589 for pi, then

Volume = 37.699111843068, etc.)

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