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定义1把射线OA绕端点O沿逆时针方向旋转到射线OB时所成的最小非负角记作∠AOB→(有0≤∠AOB→<2π).如图1,设动直线l过定点M0(x0,y0),点M(x,y)是动直线l上的动点.设r=M0M→.当点M,M0不重合时,点M在以M0为圆心、r为半径的圆C上.设以坐标原点O为圆心、r为半径的圆是C’,把圆C’按向量OM0→平移后即得圆C.又设圆C上的点M是圆C’上的点M’按向量OM0→
Definition 1 The minimum non-negative angle formed when the ray OA rotates around the endpoint O in the counterclockwise direction to the ray OB is written as ∠AOB → (there is 0≤∠AOB → <2π). As shown in Figure 1, set the straight line l M0 (x0, y0) is a fixed point, the point M (x, y) is the moving point on the moving straight line I. Let r = M0M → When the point M, M0 do not coincide, the point M in M0 as the center, r For the radius of the circle C. Let the coordinates of the origin O as the center of the circle, r is the radius of the circle is C ’, the circle C’ by the vector OM0 → → after the translation of the circle C and set the circle C on the point M is a circle Point M ’on C’ presses the vector OM0 → →