How to calculate the volume formula of a cylinder =π*r? *h=S bottom area * height (h).
1. Find the radius of the round bottom. Just find the radius of one of the bottom surfaces, because their areas are equal. If the radius is known, proceed to the next step. If you are not sure of its radius, you can measure the widest part of the circle with a ruler and then divide the result by 2 to get the radius length. This is more accurate than directly measuring the radius. In this example, it is assumed that the radius of the cylinder is 1 cm. Write down the radius value.
If the diameter of the circle is known, divide the diameter by 2.
If the circumference of a circle is known, divide it by 2π.
2. Calculate the area of the circular bottom of the cylinder. Use the formula: A = πr2 to calculate the circular area. Just use r in the formula instead of the radius of the cylinder you need to calculate. This method is shown in the following figure:
A = π x 12 =
A = π x 1 .
Because the value of π is about 3. 14, it can be considered that the garden area is 3.14cm.2.
3. Find the height of the cylinder. If so, please proceed to the next step. Otherwise you can measure it with a ruler. The height of a cylinder is the distance between its two bottom surfaces.
4. Multiply the height by the area of the bottom surface. You can think that the volume of a cylinder is the volume after the bottom of the cylinder extends the same distance as the height of the cylinder. The unit of the final result should always appear in the form of a cube, because you are calculating the volume of the cube.
Extended reading: How to memorize the formula 1 quickly? Have good math learning methods and habits.
Good math study habits will reduce the difficulty of math study. If you want to learn to memorize classroom knowledge in your own special way, you must preview carefully, concentrate on class, review in time, work independently and summarize systematically.
2. Master commonly used mathematical ideas and methods.
When doing math problems, we should also pay attention to solving the problem of thinking strategy, and often think about: what angle to choose, what principles to follow, and whether we can use any mathematical formula to do these problems.
3. Gradually develop a "self-centered" learning model.
To learn mathematics, we must actively participate in the learning process, develop a scientific attitude of seeking truth from facts, and have the innovative spirit of independent thinking and bold exploration; We should be able to learn from textbooks and find the best learning method according to our own characteristics.
Effective methods of learning mathematics.
Textbooks are the main source of students' knowledge, but they are not the only source. In the process of learning, in addition to studying textbooks carefully, we should also read relevant extracurricular materials to expand our knowledge. At the same time, on the basis of extensive reading, do research seriously and master its knowledge structure.
Imitation and innovative imitation are both indispensable learning methods in mathematics learning, but they must not be copied mechanically. On the basis of digestion and understanding, use your brains and put forward your own opinions and opinions, instead of sticking to the existing framework and existing model.
To review what you have learned in the memory enhancement class in time, you must digest it on the same day, review it first, then do exercises and review it frequently. Every time you finish a unit, you should summarize and sort out what you have learned to make it systematic and profound.
Summarizing learning experience and evaluating learning effect is the continuation and improvement of learning, which is conducive to the establishment of knowledge system, the mastery of problem-solving laws, the adjustment of learning methods and attitudes, and the improvement of judgment ability. In the process of learning, we should pay attention to summing up the gains and experiences of listening to lectures, reading books and solving problems. The next step is the learning method involving specific content.