四年級(jí)總復(fù)習(xí)二(軸對(duì)稱圖形平移旋轉(zhuǎn)平行)

1、四年級(jí)數(shù)學(xué)總復(fù)習(xí)（二）四年級(jí)數(shù)學(xué)總復(fù)習(xí)（二） 對(duì)稱對(duì)稱 平移平移 旋轉(zhuǎn)旋轉(zhuǎn) 平行平行 相交相交 欣欣 賞賞 精精 美美 圖圖 片片 中國(guó)戲曲臉譜中國(guó)戲曲臉譜李天王李天王巨靈神巨靈神 張張 飛飛 蓋書文蓋書文 李李 逵逵北京天安門北京天安門斯里蘭卡印度 泰姬陵軸對(duì)稱圖形定義：軸對(duì)稱圖形定義： 如果如果 沿一條直線折疊沿一條直線折疊, ,直線兩直線兩旁的部分能夠旁的部分能夠 _,_,那么這個(gè)圖形就叫做那么這個(gè)圖形就叫做_._.這條這條直線直線 叫做叫做_._.對(duì)稱軸對(duì)稱軸一個(gè)平面圖形一個(gè)平面圖形完全重合完全重合軸對(duì)稱圖形軸對(duì)稱圖形對(duì)稱軸對(duì)稱軸對(duì)稱軸對(duì)稱軸軸對(duì)稱圖形軸對(duì)稱圖形軸對(duì)稱圖形軸對(duì)稱圖形練習(xí)

2、練習(xí):下面的圖形是軸對(duì)稱圖形嗎下面的圖形是軸對(duì)稱圖形嗎?如果是如果是,你能指你能指出它的對(duì)稱軸嗎出它的對(duì)稱軸嗎?是是是是是不是是是圖形圖形形狀形狀是否軸對(duì)稱圖形是否軸對(duì)稱圖形 對(duì)稱軸的數(shù)量對(duì)稱軸的數(shù)量 長(zhǎng)方形長(zhǎng)方形 正方形正方形平行四邊形平行四邊形 等腰三角形等腰三角形 圓形圓形 線段線段 角角是是是是是是是是不是不是241無數(shù)無數(shù)0是是是是21 平面內(nèi)兩個(gè)如果把一個(gè)圖平面內(nèi)兩個(gè)如果把一個(gè)圖形沿著某一條直線折疊后，能形沿著某一條直線折疊后，能夠與另一個(gè)圖形重合，那么這夠與另一個(gè)圖形重合，那么這兩個(gè)圖形關(guān)于這條直線成兩個(gè)圖形關(guān)于這條直線成軸對(duì)軸對(duì)稱稱， 軸對(duì)稱軸對(duì)稱軸對(duì)稱、對(duì)稱軸、對(duì)稱點(diǎn)軸對(duì)稱、

3、對(duì)稱軸、對(duì)稱點(diǎn) ABCD這條直線叫做這條直線叫做對(duì)稱軸。對(duì)稱軸。折疊重合的兩點(diǎn)叫折疊重合的兩點(diǎn)叫對(duì)應(yīng)點(diǎn)對(duì)應(yīng)點(diǎn)也叫對(duì)稱點(diǎn)。也叫對(duì)稱點(diǎn)。 A BC DE F對(duì)稱點(diǎn)對(duì)稱軸Lo1o2o3你能把小亭子圖從左上方平移到右下方嗎?找對(duì)應(yīng)點(diǎn)找對(duì)應(yīng)點(diǎn)先向下平移4格，4 4格格可以這樣可以這樣移移找對(duì)應(yīng)點(diǎn)找對(duì)應(yīng)點(diǎn)先向下平移4格， 再向右平移6格。6 6格格找對(duì)應(yīng)點(diǎn)找對(duì)應(yīng)點(diǎn)先向右平移6格，6 6格格還可以這還可以這樣移樣移找對(duì)應(yīng)點(diǎn)找對(duì)應(yīng)點(diǎn)先向右平移6格，再向下平移4格。平移的時(shí)候要找準(zhǔn)對(duì)應(yīng)點(diǎn)平移的時(shí)候要找準(zhǔn)對(duì)應(yīng)點(diǎn)4 4格格找對(duì)應(yīng)點(diǎn)找對(duì)應(yīng)點(diǎn) 小船圖先向（ ）平移了（ ）格，再向（ ）平移了（ ）格。找對(duì)應(yīng)點(diǎn)找對(duì)應(yīng)點(diǎn)

4、電燈圖先向（ ）平移了（ ）格，再向（ ）平移了（ ）格。找對(duì)應(yīng)點(diǎn)找對(duì)應(yīng)點(diǎn)平行四邊形先向右平移5格，再向上平移4格。5格找對(duì)應(yīng)點(diǎn)找對(duì)應(yīng)點(diǎn)平行四邊形先向右平移5格，再向上平移4格。5格4格找對(duì)應(yīng)點(diǎn)找對(duì)應(yīng)點(diǎn)與時(shí)針旋轉(zhuǎn)方向相同的是與時(shí)針旋轉(zhuǎn)方向相同的是順時(shí)針順時(shí)針，與時(shí)針旋轉(zhuǎn)方向相反的是與時(shí)針旋轉(zhuǎn)方向相反的是逆時(shí)針逆時(shí)針。轉(zhuǎn)桿關(guān)閉的方向轉(zhuǎn)桿關(guān)閉的方向與時(shí)鐘轉(zhuǎn)動(dòng)方向與時(shí)鐘轉(zhuǎn)動(dòng)方向一致嗎一致嗎？轉(zhuǎn)桿打開的方向轉(zhuǎn)桿打開的方向與時(shí)鐘轉(zhuǎn)動(dòng)方向與時(shí)鐘轉(zhuǎn)動(dòng)方向一致嗎？一致嗎？A你會(huì)把右邊的三角板繞A點(diǎn)旋轉(zhuǎn)90。嗎？找對(duì)應(yīng)邊找對(duì)應(yīng)邊A把三角板繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊A把三角板繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。找對(duì)

5、應(yīng)邊找對(duì)應(yīng)邊A把三角板繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊A把三角板繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊A把三角板繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊A把三角板繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊A把三角板繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊A把三角板繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊A把三角板繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)9

6、0。找對(duì)應(yīng)邊找對(duì)應(yīng)邊A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊從6：00到9：00，時(shí)針沿著（ ）方向旋轉(zhuǎn)了（ ） 。 。A如何畫三角板順時(shí)針旋轉(zhuǎn)如何畫三角板順時(shí)針旋轉(zhuǎn)90900 0后的圖形？后的圖形？找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針

7、旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。

8、找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針

9、旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。找對(duì)應(yīng)邊找對(duì)應(yīng)邊AB直線直線AB或或BA線段線段直線直線（線段（線段AB或或BA、射線射線AB、射線射線BA）直線上兩點(diǎn)間的一部分是直線上兩點(diǎn)間的一部分是 。 把一條線段由兩端向外無限延伸后可以得把一條線段由兩端向外無限延伸后可以得到一條到一條 。射線和線段可以看成是射線和線段可以看成是 上的一部分。上的一部分。直線直線圖圖圖圖在同一平面內(nèi)在同一平面內(nèi)相交相交的兩條直線的兩條直線在同一平面內(nèi)在同一平面內(nèi)相交相交的兩條直線的兩條直線在同一平面內(nèi)在同一平面內(nèi)不相交不相交的兩條直線的兩條直線圖圖圖圖L2L1 在同一平面內(nèi)，不相交的兩條直線在同一平面內(nèi)，不相交的兩條直線叫做叫做平行線平行線。直線直線 L1L1與與L2L2互相平行互相平行直線直線 L1L1平行于平行于L2L2，直線，直線 L2L2也也平行于平行于L1L1在同一平面內(nèi)在同一平面內(nèi)不相交的不