四年級(jí)下冊(cè)圖形的旋轉(zhuǎn)課件

1.2旋轉(zhuǎn)第1單元平移、旋轉(zhuǎn)、軸對(duì)稱1.2旋轉(zhuǎn)第1單元平移、旋轉(zhuǎn)、軸對(duì)稱1、進(jìn)一步認(rèn)識(shí)圖形的旋轉(zhuǎn)，認(rèn)識(shí)按順時(shí)針或逆時(shí)針?lè)较蛐D(zhuǎn)90o的含義。2、能在方格紙上把簡(jiǎn)單圖形旋轉(zhuǎn)90o，畫出旋轉(zhuǎn)后的圖形。3、掌握旋轉(zhuǎn)的三要素。學(xué)習(xí)目標(biāo)1、進(jìn)一步認(rèn)識(shí)圖形的旋轉(zhuǎn)，認(rèn)識(shí)按順時(shí)針或逆時(shí)針?lè)较蛐D(zhuǎn)90o從這幅圖中你看到了哪些運(yùn)動(dòng)？探究新知從這幅圖中你看到了哪些運(yùn)動(dòng)？探究新知大家認(rèn)真自學(xué)書上第3頁(yè)的例2，并思考下面的問(wèn)題（5分鐘）導(dǎo)學(xué)問(wèn)題：1、圖中的轉(zhuǎn)桿打開(kāi)和關(guān)閉分別是怎樣運(yùn)動(dòng)的？有什么相同點(diǎn)和不同點(diǎn)？2、轉(zhuǎn)桿的打開(kāi)和關(guān)閉，分別繞哪個(gè)點(diǎn)按什么方向旋轉(zhuǎn)的?旋轉(zhuǎn)了多少度？3、你能完整地描述轉(zhuǎn)桿打開(kāi)和關(guān)閉的過(guò)程嗎？大家認(rèn)真自學(xué)書上第3頁(yè)的例2，并思考下面的問(wèn)題（5分鐘）轉(zhuǎn)桿打開(kāi)和關(guān)閉，它們的運(yùn)動(dòng)有什么相同點(diǎn)和不同點(diǎn)？相同點(diǎn)：轉(zhuǎn)桿打開(kāi)和關(guān)閉都是繞著一個(gè)點(diǎn)旋轉(zhuǎn)。不同點(diǎn)：轉(zhuǎn)桿打開(kāi)和關(guān)閉旋轉(zhuǎn)的方向正好相反。轉(zhuǎn)桿打開(kāi)和關(guān)閉，它們的運(yùn)動(dòng)有什么相同點(diǎn)和不同點(diǎn)？相同點(diǎn)：不同與時(shí)針旋轉(zhuǎn)方向相同的是順時(shí)針，與時(shí)針旋轉(zhuǎn)方向相反的是逆時(shí)針。與時(shí)針旋轉(zhuǎn)方向相同的是順時(shí)針，轉(zhuǎn)桿關(guān)閉的方向與時(shí)鐘轉(zhuǎn)動(dòng)方向一致嗎？轉(zhuǎn)桿打開(kāi)的方向與時(shí)鐘轉(zhuǎn)動(dòng)方向一致嗎？順時(shí)針?lè)较蚰鏁r(shí)針?lè)较蜣D(zhuǎn)桿關(guān)閉的方向與時(shí)鐘轉(zhuǎn)動(dòng)方向一致嗎？轉(zhuǎn)桿打開(kāi)的方向與時(shí)鐘轉(zhuǎn)動(dòng)從6：00到9：00，時(shí)針旋轉(zhuǎn)了（）。。90從6：00到9：00，時(shí)針旋轉(zhuǎn)了（）A你會(huì)把右邊的三角板繞A點(diǎn)旋轉(zhuǎn)90。嗎？A你會(huì)把右邊的三角板繞A點(diǎn)旋轉(zhuǎn)90。嗎？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。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。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。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。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。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。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。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。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。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。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。旋轉(zhuǎn)有哪三要素？1、旋轉(zhuǎn)中心。（繞某點(diǎn)）2、旋轉(zhuǎn)方向。（順時(shí)針或逆時(shí)針）3、旋轉(zhuǎn)角度。（旋轉(zhuǎn)90度或其他角度）完整描述旋轉(zhuǎn)：某圖形繞某點(diǎn)順時(shí)針（或逆時(shí)針）旋轉(zhuǎn)多少度。如：三角形繞點(diǎn)A逆時(shí)針旋轉(zhuǎn)90°。旋轉(zhuǎn)有哪三要素？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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。AB把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9ABCD指針按順時(shí)針?lè)较蛐D(zhuǎn)90。，從A旋轉(zhuǎn)（）；指針按逆時(shí)針?lè)较蛐D(zhuǎn)90。，從B旋轉(zhuǎn)（）。ABCDBA錯(cuò)誤解答ABCD指針按順時(shí)針?lè)较蛐D(zhuǎn)90。，從A指針按逆時(shí)針?lè)较蛐e(cuò)解分析：與時(shí)針旋轉(zhuǎn)方向相同的是順時(shí)針?lè)较?，與時(shí)針旋轉(zhuǎn)方向相反的是逆時(shí)針?lè)较颉ｅe(cuò)解分析：與時(shí)針旋轉(zhuǎn)方向相同的是順時(shí)針?lè)较?，ABCD指針按順時(shí)針?lè)较蛐D(zhuǎn)90。，從A旋轉(zhuǎn)（）；指針按逆時(shí)針?lè)较蛐D(zhuǎn)90。，從B旋轉(zhuǎn)（）。ABCDABCDABCDDC正確解答ABCD指針按順時(shí)針?lè)较蛐D(zhuǎn)90。，從A指針按逆時(shí)針?lè)较蛐阋?jiàn)過(guò)生活中的哪些旋轉(zhuǎn)現(xiàn)象？你能說(shuō)出來(lái)嗎？你見(jiàn)過(guò)生活中的哪些旋轉(zhuǎn)現(xiàn)象？你能說(shuō)出來(lái)嗎？旋轉(zhuǎn)有哪三要素？1、旋轉(zhuǎn)中心。（繞某點(diǎn)）2、旋轉(zhuǎn)方向。（順時(shí)針或逆時(shí)針）3、旋轉(zhuǎn)角度。（旋轉(zhuǎn)90度或其他角度）完整描述旋轉(zhuǎn)：某圖形繞某點(diǎn)順時(shí)針（或逆時(shí)針）旋轉(zhuǎn)多少度。如：三角形繞點(diǎn)A逆時(shí)針旋轉(zhuǎn)90°。旋轉(zhuǎn)有哪三要素？謝謝謝謝1.2旋轉(zhuǎn)第1單元平移、旋轉(zhuǎn)、軸對(duì)稱1.2旋轉(zhuǎn)第1單元平移、旋轉(zhuǎn)、軸對(duì)稱1、進(jìn)一步認(rèn)識(shí)圖形的旋轉(zhuǎn)，認(rèn)識(shí)按順時(shí)針或逆時(shí)針?lè)较蛐D(zhuǎn)90o的含義。2、能在方格紙上把簡(jiǎn)單圖形旋轉(zhuǎn)90o，畫出旋轉(zhuǎn)后的圖形。3、掌握旋轉(zhuǎn)的三要素。學(xué)習(xí)目標(biāo)1、進(jìn)一步認(rèn)識(shí)圖形的旋轉(zhuǎn)，認(rèn)識(shí)按順時(shí)針或逆時(shí)針?lè)较蛐D(zhuǎn)90o從這幅圖中你看到了哪些運(yùn)動(dòng)？探究新知從這幅圖中你看到了哪些運(yùn)動(dòng)？探究新知大家認(rèn)真自學(xué)書上第3頁(yè)的例2，并思考下面的問(wèn)題（5分鐘）導(dǎo)學(xué)問(wèn)題：1、圖中的轉(zhuǎn)桿打開(kāi)和關(guān)閉分別是怎樣運(yùn)動(dòng)的？有什么相同點(diǎn)和不同點(diǎn)？2、轉(zhuǎn)桿的打開(kāi)和關(guān)閉，分別繞哪個(gè)點(diǎn)按什么方向旋轉(zhuǎn)的?旋轉(zhuǎn)了多少度？3、你能完整地描述轉(zhuǎn)桿打開(kāi)和關(guān)閉的過(guò)程嗎？大家認(rèn)真自學(xué)書上第3頁(yè)的例2，并思考下面的問(wèn)題（5分鐘）轉(zhuǎn)桿打開(kāi)和關(guān)閉，它們的運(yùn)動(dòng)有什么相同點(diǎn)和不同點(diǎn)？相同點(diǎn)：轉(zhuǎn)桿打開(kāi)和關(guān)閉都是繞著一個(gè)點(diǎn)旋轉(zhuǎn)。不同點(diǎn)：轉(zhuǎn)桿打開(kāi)和關(guān)閉旋轉(zhuǎn)的方向正好相反。轉(zhuǎn)桿打開(kāi)和關(guān)閉，它們的運(yùn)動(dòng)有什么相同點(diǎn)和不同點(diǎn)？相同點(diǎn)：不同與時(shí)針旋轉(zhuǎn)方向相同的是順時(shí)針，與時(shí)針旋轉(zhuǎn)方向相反的是逆時(shí)針。與時(shí)針旋轉(zhuǎn)方向相同的是順時(shí)針，轉(zhuǎn)桿關(guān)閉的方向與時(shí)鐘轉(zhuǎn)動(dòng)方向一致嗎？轉(zhuǎn)桿打開(kāi)的方向與時(shí)鐘轉(zhuǎn)動(dòng)方向一致嗎？順時(shí)針?lè)较蚰鏁r(shí)針?lè)较蜣D(zhuǎn)桿關(guān)閉的方向與時(shí)鐘轉(zhuǎn)動(dòng)方向一致嗎？轉(zhuǎn)桿打開(kāi)的方向與時(shí)鐘轉(zhuǎn)動(dòng)從6：00到9：00，時(shí)針旋轉(zhuǎn)了（）。。90從6：00到9：00，時(shí)針旋轉(zhuǎn)了（）A你會(huì)把右邊的三角板繞A點(diǎn)旋轉(zhuǎn)90。嗎？A你會(huì)把右邊的三角板繞A點(diǎn)旋轉(zhuǎn)90。嗎？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。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。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。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。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。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。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。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。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。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。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。A把三角板繞A點(diǎn)逆時(shí)針旋轉(zhuǎn)90。旋轉(zhuǎn)有哪三要素？1、旋轉(zhuǎn)中心。（繞某點(diǎn)）2、旋轉(zhuǎn)方向。（順時(shí)針或逆時(shí)針）3、旋轉(zhuǎn)角度。（旋轉(zhuǎn)90度或其他角度）完整描述旋轉(zhuǎn)：某圖形繞某點(diǎn)順時(shí)針（或逆時(shí)針）旋轉(zhuǎn)多少度。如：三角形繞點(diǎn)A逆時(shí)針旋轉(zhuǎn)90°。旋轉(zhuǎn)有哪三要素？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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。AB把小旗圖繞B點(diǎn)逆時(shí)針旋轉(zhuǎn)90。把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。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)9AB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。AB把長(zhǎng)方形繞A點(diǎn)順時(shí)針旋轉(zhuǎn)90。把小旗圖繞