The knowledge point of "proportion in leaves" is introduced into the mathematics curriculum, which is specifically in the first volume of mathematics in the eighth grade of junior high school. In this course, students will learn how to use proportion to compare the relationship between two or more quantities.

First, students need to know what proportion is. Proportion is the ratio of two or more quantities, usually expressed by a colon or an equal sign. For example, if the ratio of the crown circumference to the trunk circumference of a tree is 3: 1, it means that the crown circumference is three times the trunk circumference.

In order to calculate the proportion, students need to use mathematical formulas. For example, if the crown circumference of a tree is c and the trunk circumference is t, then the ratio can be expressed as C:T=3: 1. In order to calculate this ratio, students need to know the circumference of the crown and trunk. In addition to calculating proportions, students need to know how to use proportions to solve problems. For example, students can use ratios to compare the sizes of different trees or the growth rates of different plants.

In addition to the knowledge of proportion introduced in mathematics courses, students can also learn about proportion in science courses. For example, in biology, students can learn the proportional relationship between the size and shape of different creatures. These proportional relationships can help students better understand the structure and function of organisms.

In short, the first volume of the eighth grade mathematics in junior high school introduced the knowledge point of "leaf-to-leaf ratio" In this course, students will learn how to use proportion to compare the relationship between two or more quantities and understand how to use proportion to solve problems. In addition to the knowledge of proportion introduced in mathematics courses, students can also learn about proportion in science courses. This knowledge will help students better understand the world around them.

In short, the knowledge point of "proportion in leaves" is not only introduced in mathematics and science courses, but also runs through students' daily life and various activities. By learning proportional knowledge, students can better understand the world around them, solve various problems and improve their thinking ability and creativity.