《全等三角形的判定》2

第十三章全等三角形全等三角形的判定

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2.相交線型：兩個(gè)三角形存在公共邊或或公共角

3.旋轉(zhuǎn)型：一個(gè)三角形由另一個(gè)三角形經(jīng)過(guò)旋轉(zhuǎn)形成(旋轉(zhuǎn)中心是三角形的頂點(diǎn))在你的導(dǎo)學(xué)案上畫出你擺放好的圖形整理ppt動(dòng)手做一做提示：1.平行線型：兩個(gè)三角形有一組或兩組組對(duì)應(yīng)邊平行2.相交線型：兩個(gè)三角形存在公共邊或或公共角3.旋轉(zhuǎn)型：一個(gè)三角形由另一個(gè)三角形經(jīng)過(guò)旋轉(zhuǎn)形成(旋轉(zhuǎn)中心是三角形的頂點(diǎn))在你的導(dǎo)學(xué)案上畫出你擺放好的圖形整理pptBACNPMACBDEABCDCB圖1圖2圖3圖4圖5ABDCADE看看兩個(gè)全等三角形是怎樣形成的？整理ppt事實(shí)上：在我們遇到的兩個(gè)全等三角形中，有些圖形具有特殊的位置關(guān)系〔即：其中一個(gè)三角形是由另一個(gè)三角形經(jīng)過(guò)、或〔有時(shí)是兩種變換〕得到的，發(fā)現(xiàn)這種特殊的關(guān)系，能夠幫我們找到命題證明的途徑，較快的解決問(wèn)題。翻折平移旋轉(zhuǎn)整理ppt時(shí)間預(yù)設(shè)與分組展示：1.自主探究新知〔5分鐘〕3.小組展示：〔8分鐘〕

4.歸納小結(jié)〔2分鐘〕6.檢測(cè)〔6分鐘〕2.小組合作探究例題〔備展〕〔3分鐘〕5.穩(wěn)固練習(xí)〔8分鐘〕整理ppt探索新知具有特殊位置關(guān)系的全等三角形的證明例1：：如圖13-3-12，在△ABC中，D是BC的中點(diǎn)，DE∥AB，交AC于點(diǎn)E,DF∥AC,交AB于點(diǎn)F.求證：△BDF≌△DCE.ABFDCE整理pptEDC例1：：如圖13-3-12，在△ABC中，D是BC的中點(diǎn)，DE∥AB，交AC于點(diǎn)E,DF∥AC,交AB于點(diǎn)F.求證：△BDF≌△DCE.ABFDCE整理pptBCFADE例2：：如圖