= area of a circle = pi*r^2
or
length x width if the cross section is longitudinal (since the area will be rectangular)
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The volume of a cylinder is the cross-sectional area of the cylinder multiplied by its length. The perpendicular cross-section of a cylinder is a circle.
It is the same as that of an area of a circle which is: pi times radius squared.
Find the cross-sectional area of the cylinder (pi x the radius2), the multiply that by the height of the cylinder
You cannot create a cross sectional area of a rectangle. You can only create cross sectional areas for triangular shapes.
the larger the cross sectional area, the smaller the resistance