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Grade 8 Math · Problem type
Which volume formula?
Use this for “Which formula finds the volume of a funnel?”
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Which formula finds the volume?
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Assumptions
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A cylinder is a circle stacked up: π × r² × h.
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A cone holds a third of the cylinder with its base and height.
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A sphere is 4/3 × π × r³; a box is length × width × height.
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Related lessons
Volume of cylinders, cones and spheres
Main lesson
Volume of a cone
Use this for “A cone has radius 3 and height 7. What is its volume?” or “A cone holds 18π with height 6: its radius?”
Volume of a sphere
Use this for “A ball of radius 3 cm: its volume” or “A ball just fits in a 4-inch box: is its volume more or less than half of 4³?”
Change one dimension
Use this for “A cylinder holds 60π cm³. What does it hold at 3 times the height?” or “Quadruple the radius of a cone.”