高中数学教材中角的概念很多,并且各种角的取值范围往往不同,学生很容易混淆。而数学习题中涉及角的概念的有各种类型,例如: 1.已知:平面α∩平面β=c,a(?)α,且a上c,b(?)β,且b上c,α与β所成的角等于(2π)/3,求a与b所成的角。 2.(选择题)复数sin50°-icos0°的幅角的主值是(A)50°;(B)40°;(C)320°;(D)220°。 3.(选择题)直线X+2~(1/2)y-1=0的倾斜角是(A)π/4;(B)arctg(2~(1/2))/2;(C)arctg(-(2~(1/2))/2);(D)(3π)/4;(E)π-arctg(3~(1/2))/2。要准确回答以上问题,就必须对有关角的概念 High school mathematics teaching corner of the concept of a lot, and the range of values ​​of various angles are often different, students can easily be confused. However, there are various types of concepts involved in mathematical problems such as: 1. It is known that the plane α∩ plane β = c, a (?) Α, and a on c, b (?) Β, and b on c , α and β angle is equal to (2π) / 3, find the angle formed by a and b. 2. (Multiple choice) The major values ​​of the complex sin50 ° -icos0 ° argument are (A) 50 °; (B) 40 °; (C) 320 °; (D) 220 °. 3. (Multiple Choice) The tilt angle of the straight line X + 2 ~ (1/2) y-1 = 0 is (A) π / 4; ) arctg (- (2 ~ (1/2)) / 2); (D) (3π) / 4; (E) π-arctg (3 ~ (1/2)) / 2. To accurately answer the above questions, it must be the concept of the angle