The calculation of cylinder volume is very simple, and the formula is: the bottom area x is high. Using this formula, the volume of a cylinder can be calculated. If you only know the radius or diameter of the bottom surface at first, you must first calculate the area of the surface and then calculate the volume of the cylinder.
Next, let's look at the surface area of the cylinder. Finding the surface area of a cylinder is more complicated than its volume. Because, first find the lateral area of the cylinder, then calculate the area of the upper bottom and the lower bottom of the cylinder, and then add the three to get the surface area of the cylinder. Although the calculation of its surface area is a bit complicated, as long as the method and formula are mastered, practice will make perfect and it will be done quickly.
Next, let's learn about cones. A cone is a circle at the bottom and extends upward until the top forms a sharp angle. In fact, the volume of the cone is also easy to find, only one-third more than the volume of the cylinder, that is, the bottom area x is high? 3。 Because all cones are 1/3 of the volume of a cylinder with the same base and height. So calculate the volume of the cylinder first, and then divide it by 3, which is the volume of the cone.
Although the book doesn't mention the surface area of a cone, I know it.