A formula for calculating the surface area of a cylinder

A formula for calculating the surface area of a cylinder

First, find out the radius = diameter / 2
Then calculate the bottom area = 3.14 * square of radius * 2
Then calculate the perimeter of the bottom surface = 3.14 * diameter
Then calculate the side area = bottom perimeter * height
Finally, the surface area = side area + bottom area is obtained

The height of a cylinder is π times the diameter of its bottom. The side view of the cylinder is a () shape. The radius of its bottom is 5cm and its side area is ()

Because the height is π times of the diameter of the bottom, the height and the perimeter of the bottom are π times of the diameter, so the expanded figure is square, and the side area is (10 π) ^ 2

The area formula of circle

Square of π × (diameter △ 2)

Volume formula of cylinder
When it's done, we'll see

In ancient times, people would make a huge ball. When I was a child, I thought it was very unthinkable. Since I was in junior high school, I understood it. First, I made a cube, then. Finally, I made an equilateral body with many sides. Finally, it became a ball. The more sides, the rounder the ball was