The simple closed curve is called the base of the cone, and the fixed noncoplanar point is the vertex. ... Figure %: A right circular cone It is easy to see the close relationship between pyramids and cones. The only difference is the base--a pyramid is a cone with a polygonal base.
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mathematicallly error sentence!
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The equation i came up with is $55= 7.8x - 47.20
Find the area of the base
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Multiply area of the base by height to get volume

Hope this helps.