1, we need to know the definition and properties of trigonometric functions. In the mathematics of moving single stroke, the commonly used trigonometric functions are sine function, cosine function and tangent function. These functions have their own definitions and properties. For example, sine function is defined as sinx= opposite side/hypotenuse, cosine function is defined as cosx= adjacent side/hypotenuse, and tangent function is defined as tanx= opposite side/adjacent side.
2. When calculating the area of triangle, we usually use the definition and properties of sine or cosine function. For example, for a right triangle, we can use Pythagorean theorem to find the length of the hypotenuse, and then use the definition of sine or cosine function to calculate the length of the opposite side or adjacent side, thus obtaining the area of the triangle.
3. When calculating the area of quadrilateral, we usually use the definition and properties of tangent function. For example, for a right-angled trapezoid, we can use the definition of tangent function to calculate the angle between the upper and lower bottoms, and then use the area formula of trapezoid to calculate the area of quadrilateral.
Sports single stroke related knowledge
1. The registration conditions for sports single strokes include: high school graduation or equivalent; Having the technical level qualification of second-class athlete or second-class samurai (inclusive) or above; No more than 22 years old; Have the qualification of first-class athlete or first-class samurai (inclusive) or above, and the age can be relaxed to 35 years old.
2. The content of sports single-recruit examination mainly includes two parts: cultural examination and sports additional examination. Cultural examination is a standardized examination organized by the state, which mainly examines the knowledge of basic subjects such as Chinese, mathematics and foreign languages. Physical education extra test is an examination of candidates' physical education professional ability, including sports skills and physical fitness.
2. The principle of single-recruit admission for physical education is that the results of cultural courses are the main ones, supplemented by the results of physical education test, and admission is from high to low according to the results of cultural courses. If the two candidates have the same results in the cultural course, they will be admitted according to the results of the physical education test. The advantage of sports single move is that it provides opportunities for those students who have sports expertise but average academic performance to enter high-level sports teams.