1, understand the characteristics of π: π is an infinite acyclic decimal with a value of about 3. 14. In the process of reciting, we should understand the characteristics of π, such as its pattern of digital circulation after decimal point and its relationship with rational numbers. Lots of practice: The most important thing is lots of practice. Through repeated recitation and practice, we can deepen our impression of 1 to 20π and gradually master their values.
2. Segmented memory: divide 1 to 20π into several segments, each segment contains several π values. For example, divide 1 to 20π into 5 segments, each segment including 4 π values. In this way, the numbers of each paragraph can be combined to form a rhythmic formula, which is convenient for memory. Find the law: In 1 to 20π, some numbers are regular, for example, the values of 5π and 10π are all integers.
3. Making a memory card: Write the value of 1 to 20π on one side of the memory card and the corresponding number on the other side. By looking at the memory card repeatedly, we can deepen our impression of π value. It takes skill and patience to recite the pie from 1 to 20π. Mastering the appropriate skills will get twice the result with half the effort.
Related knowledge of π
1 and π are mathematical constants, also called pi. It represents the ratio of the circumference to the diameter of a circle, which is approximately equal to 3. 14 159. π is widely used in mathematics, science, engineering and daily life. In daily life, π is also ubiquitous. For example, in cooking, π is often used in molds for making cakes or cookies.
2. In mathematics, π is a very important constant. It appears in many mathematical formulas and theorems, such as the area formula of a circle A=πr? , the volume formula of cylinder V=πr? H, wait In addition, π is also related to some important mathematical concepts, such as trigonometric function and infinite series.
3.π is also widely used in science and engineering. For example, in physics, π appears in some basic formulas, such as the law of universal gravitation and Coulomb's law. In computer science, π is used to calculate the surface area and volume of circles and spheres, and to do some geometric calculations.