ideological and theoretical qualities and practical working ability, and strive to build a contingent of league cadres with positive work style and high quality. Hold a regular meting of the party secretary every fortnightly, arrange the work of the regiment, fedback the student information. Focus on training junior high school, junior high school secretary of the regiment branch to enable them to raise A firm political conviction, diligent and diligent learning spirit and practical and innovative work style.5.2 图形的变化【学习目标】1．经历图形的平移、旋转、翻折变化，探究图形之间的变换关系，提高操作、探究能力；2．学习图形的变换关系，培育空间想象能力，增强用数学的意识．【学习重点】通过探究图形之间的变化关系，进展空间观念，增强用数学的意识．【问题导学】问题 1．如左图，你能说明△ABC 通过怎样的移动可以得到△BAD 吗？将△ABC 可以得到△BAD． 如右图，可以看做是一个菱形经过______次旋转得到的，每次旋转______ 度．发现： 图形有三种基本变换 ， ， ．问题 2．如图所示，按要求涂色：（1）将图形 A 平移到图形 B；（2）将图形 B 沿图中虚线翻折到图形 C；（3）将图形 C 沿其右下方的顶点旋转 180°到图形D．体会各种变换的操作方法 ．问题 3．如图的四个图形，既可以通过翻折变换、又可以通过旋转变换得到的图形是 ．A．①②③④ B．①②③ C．①③ D．③ 【问题探究】问题 1．下列图形绕虚线旋转一周，形成一个几何体，在对应图形下，写出几何体的名称．Strengthen the team connection, strengthen the knowledge education among the students (especially the first grade students), and promote the formation of good school spirit with the influence of the league members. All League branches should start with recommending outstanding students as the development objects of the League, take amateur league schools as the basis, conscientiously do a good job in the work of pre-league education, league membership education, League members' vanguard ex...
