2021年中考數(shù)學(xué)專題復(fù)習(xí)第七單元圖形與變換第31課時(shí)平移與旋轉(zhuǎn)課件

UNITSEVEN第七單元圖形與變換第31課時(shí)平移與旋轉(zhuǎn)UNITSEVEN第七單元圖形與變換第31課時(shí)平移1考點(diǎn)一平移課前雙基鞏固考點(diǎn)聚焦相等平行(或共線)且相等相等全等考點(diǎn)一平移課前雙基鞏固考點(diǎn)聚焦相等平行(或共線)且相等相2考點(diǎn)二旋轉(zhuǎn)課前雙基鞏固旋轉(zhuǎn)中心旋轉(zhuǎn)角相等旋轉(zhuǎn)角全等考點(diǎn)二旋轉(zhuǎn)課前雙基鞏固旋轉(zhuǎn)中心旋轉(zhuǎn)角相等旋轉(zhuǎn)角全等3課前雙基鞏固對(duì)點(diǎn)演練題組一教材題課前雙基鞏固對(duì)點(diǎn)演練題組一教材題4課前雙基鞏固課前雙基鞏固5課前雙基鞏固題組二易錯(cuò)題【失分點(diǎn)】對(duì)平移特征認(rèn)識(shí)不清,常常出現(xiàn)平移方向錯(cuò)誤;旋轉(zhuǎn)的性質(zhì)運(yùn)用不熟練.圖31-3課前雙基鞏固題組二易錯(cuò)題【失分點(diǎn)】圖31-36課前雙基鞏固課前雙基鞏固7課前雙基鞏固課前雙基鞏固8課堂考點(diǎn)探究探究一圖形的平移圖31-6課堂考點(diǎn)探究探究一圖形的平移圖31-69課前雙基鞏固[方法模型](1)平移前后對(duì)應(yīng)點(diǎn)間的距離等于平移的距離;(2)“平移前后的兩個(gè)圖形全等〞“平移前后對(duì)應(yīng)線段平行(或共線)且相等〞是解決平移問(wèn)題的兩個(gè)根本方法.課前雙基鞏固[方法模型](1)平移前后對(duì)應(yīng)點(diǎn)間的距離等于平10課堂考點(diǎn)探究針對(duì)訓(xùn)練課堂考點(diǎn)探究針對(duì)訓(xùn)練11課堂考點(diǎn)探究課堂考點(diǎn)探究12課堂考點(diǎn)探究探究二圖形的旋轉(zhuǎn)【命題角度】

(1)判別旋轉(zhuǎn)變換,求旋轉(zhuǎn)中心和旋轉(zhuǎn)角;

(2)求旋轉(zhuǎn)后圖形的位置和點(diǎn)的坐標(biāo).圖31-9課堂考點(diǎn)探究探究二圖形的旋轉(zhuǎn)【命題角度】

(1)判別旋轉(zhuǎn)13課堂考點(diǎn)探究[方法模型](1)求旋轉(zhuǎn)角時(shí),只要找到一對(duì)對(duì)應(yīng)點(diǎn)和旋轉(zhuǎn)中心的夾角即可;(2)旋轉(zhuǎn)不改變圖形的大小,旋轉(zhuǎn)前后的兩個(gè)圖形全等.課堂考點(diǎn)探究[方法模型](1)求旋轉(zhuǎn)角時(shí),只要找到一對(duì)對(duì)應(yīng)14課堂考點(diǎn)探究針對(duì)訓(xùn)練課堂考點(diǎn)探究針對(duì)訓(xùn)練15課堂考點(diǎn)探究課堂考點(diǎn)探究16課堂考點(diǎn)探究課堂考點(diǎn)探究17課堂考點(diǎn)探究課堂考點(diǎn)探究18課堂考點(diǎn)探究探究三平移、旋轉(zhuǎn)作圖【命題角度】

(1)平移或旋轉(zhuǎn)作圖;

(2)平移、旋轉(zhuǎn)的綜合作圖,并進(jìn)展相關(guān)計(jì)算.圖31-14課堂考點(diǎn)探究探究三平移、旋轉(zhuǎn)作圖【命題角度】

(1)平移或19課堂考點(diǎn)探究圖31-14課堂考點(diǎn)探究圖31-1420課堂考點(diǎn)探究圖31-1420課堂考點(diǎn)探究圖31-142021課堂考點(diǎn)探究探究四平移、旋轉(zhuǎn)與其他知識(shí)的綜合運(yùn)用圖31-15課堂考點(diǎn)探究探究四平移、旋轉(zhuǎn)與其他知識(shí)的綜合運(yùn)用圖31-122課堂考點(diǎn)探究圖31-15課堂考點(diǎn)探究圖31-1523課堂考點(diǎn)探究圖31-15課堂考點(diǎn)探究圖31-1524課堂考點(diǎn)探究針對(duì)訓(xùn)練(2)畫法不唯一,如圖③,圖④.課堂考點(diǎn)探究針對(duì)訓(xùn)練(2)畫法不唯一,如圖③,圖④.25課堂考點(diǎn)探究課堂考點(diǎn)探究26課堂考點(diǎn)探究課堂考點(diǎn)探究27課堂考點(diǎn)探究課堂考點(diǎn)探究28課堂考點(diǎn)探究課堂考點(diǎn)探究29課堂考點(diǎn)探究課堂考點(diǎn)探究30課堂考點(diǎn)探究課堂考點(diǎn)探究31UNITSEVEN第七單元圖形與變換第31課時(shí)平移與旋轉(zhuǎn)UNITSEVEN第七單元圖形與變換第31課時(shí)平移32考點(diǎn)一平移課前雙基鞏固考點(diǎn)聚焦相等平行(或共線)且相等相等全等考點(diǎn)一平移課前雙基鞏固考點(diǎn)聚焦相等平行(或共線)且相等相33考點(diǎn)二旋轉(zhuǎn)課前雙基鞏固旋轉(zhuǎn)中心旋轉(zhuǎn)角相等旋轉(zhuǎn)角全等考點(diǎn)二旋轉(zhuǎn)課前雙基鞏固旋轉(zhuǎn)中心旋轉(zhuǎn)角相等旋轉(zhuǎn)角全等34課前雙基鞏固對(duì)點(diǎn)演練題組一教材題課前雙基鞏固對(duì)點(diǎn)演練題組一教材題35課前雙基鞏固課前雙基鞏固36課前雙基鞏固題組二易錯(cuò)題【失分點(diǎn)】對(duì)平移特征認(rèn)識(shí)不清,常常出現(xiàn)平移方向錯(cuò)誤;旋轉(zhuǎn)的性質(zhì)運(yùn)用不熟練.圖31-3課前雙基鞏固題組二易錯(cuò)題【失分點(diǎn)】圖31-337課前雙基鞏固課前雙基鞏固38課前雙基鞏固課前雙基鞏固39課堂考點(diǎn)探究探究一圖形的平移圖31-6課堂考點(diǎn)探究探究一圖形的平移圖31-640課前雙基鞏固[方法模型](1)平移前后對(duì)應(yīng)點(diǎn)間的距離等于平移的距離;(2)“平移前后的兩個(gè)圖形全等〞“平移前后對(duì)應(yīng)線段平行(或共線)且相等〞是解決平移問(wèn)題的兩個(gè)根本方法.課前雙基鞏固[方法模型](1)平移前后對(duì)應(yīng)點(diǎn)間的距離等于平41課堂考點(diǎn)探究針對(duì)訓(xùn)練課堂考點(diǎn)探究針對(duì)訓(xùn)練42課堂考點(diǎn)探究課堂考點(diǎn)探究43課堂考點(diǎn)探究探究二圖形的旋轉(zhuǎn)【命題角度】

(1)判別旋轉(zhuǎn)變換,求旋轉(zhuǎn)中心和旋轉(zhuǎn)角;

(2)求旋轉(zhuǎn)后圖形的位置和點(diǎn)的坐標(biāo).圖31-9課堂考點(diǎn)探究探究二圖形的旋轉(zhuǎn)【命題角度】

(1)判別旋轉(zhuǎn)44課堂考點(diǎn)探究[方法模型](1)求旋轉(zhuǎn)角時(shí),只要找到一對(duì)對(duì)應(yīng)點(diǎn)和旋轉(zhuǎn)中心的夾角即可;(2)旋轉(zhuǎn)不改變圖形的大小,旋轉(zhuǎn)前后的兩個(gè)圖形全等.課堂考點(diǎn)探究[方法模型](1)求旋轉(zhuǎn)角時(shí),只要找到一對(duì)對(duì)應(yīng)45課堂考點(diǎn)探究針對(duì)訓(xùn)練課堂考點(diǎn)探究針對(duì)訓(xùn)練46課堂考點(diǎn)探究課堂考點(diǎn)探究47課堂考點(diǎn)探究課堂考點(diǎn)探究48課堂考點(diǎn)探究課堂考點(diǎn)探究49課堂考點(diǎn)探究探究三平移、旋轉(zhuǎn)作圖【命題角度】

(1)平移或旋轉(zhuǎn)作圖;

(2)平移、旋轉(zhuǎn)的綜合作圖,并進(jìn)展相關(guān)計(jì)算.圖31-14課堂考點(diǎn)探究探究三平移、旋轉(zhuǎn)作圖【命題角度】

(1)平移或50課堂考點(diǎn)探究圖31-14課堂考點(diǎn)探究圖31-1451課堂考點(diǎn)探究圖31-1420課堂考點(diǎn)探究圖31-142052課堂考點(diǎn)探究探究四平移、旋轉(zhuǎn)與其他知識(shí)的綜合運(yùn)用圖31-15課堂考點(diǎn)探究探究四平移、旋轉(zhuǎn)與其他知識(shí)的綜合運(yùn)用圖31-153課堂考點(diǎn)探究圖31-15課堂考點(diǎn)探究圖31-1554課堂考點(diǎn)探究圖31-15課堂考點(diǎn)探究圖31-1555課堂考點(diǎn)探究針對(duì)訓(xùn)練(2)畫法不唯一,如圖③