1. Definition and properties of right angle: The definition of right angle is the intersection angle generated when two line segments or two straight lines intersect, and its degree is 90 degrees. The properties of a right angle include: two right angles of a right angle are perpendicular to each other. A right triangle is a special triangle, and the sum of its three internal angles is 180 degrees. In geometry, right angles are widely used in the construction and calculation of various figures and shapes.
2. Determination of right angles: In mathematics, there are some methods to determine whether an angle is a right angle. For example, you can measure the degree of an angle with a protractor, or prove that an angle is a right angle with Pythagorean theorem.
3. Application of right angle: Right angle has many applications in daily life and practical application. Architecture, for example, needs to use right angles to measure and calculate angles and lengths; In mechanical manufacturing, it is necessary to use right angles to make various parts and mechanisms; In plane geometry, right angles are the basis of many geometric shapes, such as rectangles, squares and isosceles triangles.
Knowledge about mathematics
1. Mathematics is based on arithmetic. Arithmetic is the foundation of mathematics, involving basic operations such as addition, subtraction, multiplication and division, square and cube. By studying arithmetic, people can understand and describe the quantitative relations in real life, such as calculating wages and shopping for change. In addition, arithmetic also provides a foundation for other disciplines, such as calculation in physics and design in engineering.
2. Mathematics also includes algebra. Algebra is an important branch of mathematics. This paper studies the method of expressing numbers by letters and the operational properties of algebraic expressions. By studying algebra, people can understand the concepts of equations, functions and matrices more deeply and provide more effective methods for solving practical problems. In addition, algebra also provides a foundation for computer science, statistics and other disciplines.
3. Mathematics also includes geometry. Geometry is a branch of mathematics that studies the concepts of shape, size and position. By studying geometry, people can better understand the spatial relationship and measurement methods. Geometry has a wide range of applications in real life, such as architectural design, map drawing, engineering survey and so on. In addition, geometry also provides a foundation for physics, astronomy and other disciplines.