Cone volume calculation formula: V=(1/3)π(r^2)h
The formula shows that: π is the circumference, which is about 3.14; R is the radius of the bottom circle; h is the height of the cone.
Application example: if the radius of the bottom surface of the circular vertebrae R is 2cm and the height is 4cm, then the cone volume V=(1/3)π(r^2)h=（1/3）x3.14x2^2x4≈16.75cm³
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