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初中数学包括四个学习领域,分别是数与代数、空间与图形、统计与概率、实践与综合运用。“空间与图形”领域又包括“图形的认识”“图形与坐标”“图形与变换”“图形与推理”等。旋转是图形变换的一种,初中数学一共要学习4种图形的变换,分别是平移、轴对称、旋转及位似。人教版教材把旋转单独作为一个章节进行学习。在现实生活中,旋转现象普遍存在,如钟表指针的旋转、风扇扇叶的旋转、秋千的旋转、扳手拧螺丝时的旋转
Junior high school mathematics includes four learning areas, namely, numbers and algebra, space and graphics, statistics and probability, practice and comprehensive use. “Space and graphics ” area also includes “graphics understanding ” “graphics and coordinates ” “graphics and transformation ” “graphics and reasoning ” and so on. Rotation is a kind of graphics transformation, a total of junior high school mathematics to learn four kinds of graphics transform, respectively, translation, axial symmetry, rotation and bit. People’s Education Edition teaching materials to rotate as a separate chapter to learn. In real life, the phenomenon of rotation is ubiquitous, such as the rotation of the clock, the rotation of the fan blade, the rotation of the swing, the rotation of the wrench when tightening the screw