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同学们,你们在学习图形的运动这一知识时,是否对“旋转”这个知识点有点儿挠头呢?下面让刘老师给你指点迷津吧!【知识要点归纳】(1)物体围绕着某一点或轴进行不改变其大小和形状的圆周运动的现象就是旋转,这个定点称为旋转中心,转动的角称为旋转角,旋转不改变图形的大小和形状;(2)旋转的三要素:旋转中心,旋转方向,旋转角度;(3)旋转的性质:旋转前后图形全等,图形的大小、形状都不改
Students, you learn the movement of the graphics of this knowledge, whether the “spin ” knowledge of this point a little scratching it? Let the teacher let you give pointers to let it! [Knowledge points induction] (1) objects around A point or axis does not change its size and shape of the circular motion phenomenon is rotation, the fixed point is called the rotation center, the rotation angle is called the rotation angle, rotation does not change the size and shape of the graphics; (2) three elements of rotation : Rotation center, rotation direction, rotation angle; (3) the nature of rotation: the rotation before and after the congruent graphics, graphics, size, shape do not change