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what is the amount of space inside a three-dimensional object ?
a2+b2=c2
what is a three-dimensional geometric shape that tapers smoothly from a flat base ?
c2=a2+b2
what is a solid geometric figure with straight parallel sides and a circular or oval cross section ?
radius
what is straight line from the center to the circumference of a circle or sphere ?
what is a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.