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A cylinder is a geometric body formed by taking the straight line on one side of a rectangle as the rotation axis and the other three sides rotating around the rotation axis once. It has two circular bottom surfaces with the same size and parallel to each other and 1 curved side surfaces, and the side surfaces are rectangular.
Cylinders are divided into straight cylinders and inclined cylinders. When the axis of a cylinder is perpendicular to the bottom of the cylinder, the cylinder is called a straight cylinder; When the axis of a cylinder is not perpendicular to the bottom of the cylinder, it is called an oblique cylinder.
How to calculate the circumference of the bottom of a cylinder
The bottom of the cylinder is a circle, so the circumference of the cylinder bottom is the circumference of the cylinder bottom circle.
Therefore, the formula for calculating the circumference of the cylinder bottom surface is: c = 2 π r = π d.
In the formula, c is the circumference of the cylinder bottom, r is the radius of the cylinder bottom circle, d is the diameter of the cylinder bottom circle, and π is the pi, which is usually calculated as 3. 14.