Introduction to right angle:
Definition in Geometry Elements: When the adjacent angles formed by a straight line and another horizontal line are equal, each of these angles is called a right angle, and this straight line is called perpendicular to another straight line. An angle smaller than a right angle is called an acute angle, and an angle larger than a right angle but smaller than a right angle is called an obtuse angle.
Angle:
A measure of the amount of rotation when either of two intersecting lines overlaps the other. Rotation is on the plane of two straight lines and around the intersection. Angle is the unit of measuring angle, and the symbol is 0. A fillet is divided into 360 equal parts, and each part is defined as 1 degree (1 degree).
Use the number 360, because it is easily divisible. 360 has 22 real factors besides 1 and itself, including 2 to 10 except 7, so many special angles are integers.
In practical application, the angle of an integer is accurate enough. Sometimes more accurate measurements are needed, such as astronomy or the latitude and longitude of the earth. In addition to expressing degrees in decimals, degrees can also be subdivided into minutes and seconds: 1 degree is 60 minutes (60') and 1 degree is 60 seconds (60 "). For example, 40.1875 = 4011'15 ". To be more accurate, seconds are expressed in decimals instead of adding units. A right angle is an angle of 90 degrees.
Brief introduction of right triangle:
A right triangle is a geometric figure with a right angle. There are two kinds of right-angled triangles: ordinary right-angled triangles and isosceles right-angled triangles. It conforms to Pythagorean theorem and has some special properties and judgment methods.
There are many solutions to the seemingly right triangle, which makes people see things in a blur, but in fact, the structure of knowledge is very rigorous. In the process of psychological cognition, teachers should pay attention to strengthening students' cognitive training and let students experience, self-observation and adjust themselves.
This is conducive to the improvement of students' learning initiative and self-learning ability, and students' intelligence has also been improved, which is an effective way to solve how students learn.
For students' personality quality, teachers should conscientiously implement the relevant requirements of the syllabus, pay attention to cultivating students' interest in learning and good study habits, and be able to "teach students in accordance with their aptitude" according to their personality differences, so that students can establish correct beliefs and three views in the learning process and develop good study habits and personality quality.
Classroom teaching is the main channel of psychological education for middle school students. When preparing lessons, teachers should fully tap students' psychology, carry out various lectures and group activities, and provide students with psychological health education and psychological counseling in time. In school, we should form a good school spirit and management system; Good class spirit and class culture should be formed in the class;
The society should be able to expand the reform, form a good talent selection mechanism and school construction, and vigorously publicize the importance of quality teaching. As parents, we should form a correct view of children's success and create a good family atmosphere for children.
According to children's personality characteristics, naturally guide children to develop healthily. In such an environment, students can feel their position, develop good study habits, cultivate mathematics quality and promote all-round development.