紅旗教育個性化教案學生姓名：年級：科目：英語授課日期：月日上課時間：時分------時分合計：小時教學目標了解圓錐母線的概念，理解圓錐側面積計算公式，理解圓錐全面積的計算方法，并會應用公式解決問題．通過設置情景和復習扇形面積的計算方法探索圓錐側面積和全面積的計算公式以及應用它解決現實生活中的一些實際問題．重難點導航1．重點：圓錐側面積和全面積的計算公式．2．難點：探索兩個公式的由來．3．關鍵：你通過剪母線變成面的過程．教學簡案：個性化作業個性化教案真題演練授課教師評價：□準時上課：無遲到和早退現象（今日學生課堂表□今天所學知識點全部掌握：教師任意抽查一知識點，學生能完全掌握現符合共項）□上課態度認真：上課期間認真聽講，無任何不配合老師的情況（大寫）□紅旗作業完成達標：全部按時按量完成所布置的作業，無少做漏做現象審核人：學生簽字：教師簽字：備注：請交至行政前臺處登記、存檔保留，隔日無效（可另附教案內頁）大寫：壹貳叁肆簽章：一、復習引入1．什么是n°的圓心角所對的弧長和扇形面積的計算公式，并請講講它們的異同點．2．問題1：一種太空囊的示意圖如圖所示，太空囊的外表面須作特別處理，以承受重返地球大氣層時與空氣摩擦后產生的高熱，那么該太空囊要接受防高熱處理的面積應由幾部分組成的．二、探索新知我們學過圓柱的側面積是沿著它的母線展開成長方形，同理道理，我們也把連接圓錐頂點和底面圓上任意一點的線段叫做圓錐的母線．問題2：與圓柱的側面積求法一樣，沿母錐一條母線將圓錐側面剪開并展平，容易得到，圓錐的側面展開圖是一個扇形，設圓錐的母線長為L，底面圓的半徑為r，如圖24-115所示，那么這個扇形的半徑為________，扇形的弧長為________，因此圓錐的側面積為________，圓錐的全面積為________．例1．圣誕節將近，某家商店正在制作圣誕節的圓錐形紙帽，已知紙帽的底面周長為58cm，高為20cm，要制作20頂這樣的紙帽至少要用多少平方厘米的紙？（結果精確到0.1cm2）分析：要計算制作20頂這樣的紙帽至少要用多少平方厘米的紙，只要計算紙帽的側面積．解：例2．已知扇形的圓心角為120°，面積為300cm2．（1）求扇形的弧長；（2）若將此扇形卷成一個圓錐，則這個圓錐的軸截面面積為多少？分析：（1）由S扇形=求出R，再代入L=求得．（2）若將此扇形卷成一個圓錐，扇形的弧長就是圓錐底面圓的周長，就可求圓的半徑，其截面是一個以底是直徑，圓錐母線為腰的等腰三角形．解：紅旗教育個性化作業紅旗教育錯題匯編紅旗教育個性化教案紅旗教育真題演練一、用所給adj.詞的適當形式填空1.He’sas__________(clever)hissister,buthedoesn’tdohishomeworkas_______(careful)ashissister.Soheisn’tso_______(good)athislessonashissister.2.Thiscoatisas________(nice)asthatonebutisn’tso________(expensive)asthatone.3.Thiskindofbikelooksas________asthatkindbutdoesn’tsellas______asthatkind(good)4.Tomrunsas_________(quick)asKate,buthedoesn’tjumpas______asKate.(high)5.Heworksas________as6.Ihaveas_______(many)moneyasyou.7.Whopicked________apples,Jim,MikeorLucy?(much)8.Itwas_________yesterdaythanitistoday.(hot)9.Applesare_________thanpears.(delicious)10.LiQing’smothergets________(angry)becauseLiQing’sschoolreportis____(bad)thananyotherstudentinherclass.11.Itwasquite_______,Iwon’tfindanything_________thanthat.(cheap)12.Shedidn’tfeel__________,soshewenttothehospitalyesterday,butnowhefeels_______.(well)13.Hebegantostudy______(hard)thanlastterm,andhedid________(well)thanbefore,too.14.His________(old)brotheristwoyears_______(old)thanhim.15.Nootherboyinmyclasswroteso_______(good)asWeiLin.16.Healwaysbeen________(careful)inhisworkbutthistimeheworks__________(careless)17.Look_____(careful)atthedrawingandyouwillunderstandwhatImean.二、句型轉換1.Meimeidoesherhomeworkthemostcarefullyofallthestudentsinourclass,Meimeidoesherhomework_________________than___________________inourclassMeimeidoesherhomework______________than_______________________inourclass.Meimeidoesherhomework______________than______________inourclass.Meimeidoesherhomework______________than______________inourclass.2.JohnisClevererthanhisbrother.John’sbrother_______________________________John.3.Alice’sbikeismoreexpensivethanLiQing’sbike.LiQing’sbike_____________________________Alice’sbike.4.Thehighjumpismoredifficultthanthelongjump.Thelongjump______________________________thehighjump.5.What’syourfavoritesport?Whatsport_____youlike________?6.Daviddidn’trunasfastasLiLeiLiLeiran________thanDavid.7.Whichcoatdoyoulikebetter?Whichcoat____you_______?8.Ilikeredbetterthanblack.I________redtoblack.9.Ilikesingingbetterthandancing.Iprefer_________to____________.Ipreferto_______ratherthan__________.三、選擇1.Mr.SmithsthoughttheCenturyParkwasthesecond_______inShanghai. A.large B.larger C.largest D.verylarge2.Whichis_______ofthetwowords? A.difficult B.themostdifficult C.mostdifficult D.themoredifficult3.—Isthephysicsproblem_______? —Yes,Icanworkitout________. A.easy,easily B.easy,easy C.easily,easy D.easily,easily4.Youlookvery____.Haveyougotanygoodnews? A.beautiful B.happy C.well D.tired5.Ican’tkeepmyeyes__________.I’msosleepy. A.opening B.open C.closed D.closing6.Yourbikeisnewerthan________. A.my B.mine C.me D.I7.Mybrotheristheyoungest_______myfamily. A.than B.of C.for D.in8.It’sraining___________. A.moreandmorehard B.harderandharder C.morehardandmorehard9.Springis______season______theyear. A.best…in B.thebest…in C.best…of D.thebest…of10.Bettyisthemostbeautiful___________. A.allhersisters B.ofallthesisters C.ofallhersisters D.inallhersisters11.Hissisteristwoyears_______thanher. A.old B.older C.elder D.oldest12.It’s________togothereearlier. A.muchgood B.better C.best D.thebest13.—Whojumped________ofallinthelongjump?—Anndid. A.longest B.longer C.farther D.farthest14.Idon’tthinkscienceis_______foreignlanguages. A.asmoreinterestingas B.asinterestingas C.asinterestingthan15.Indiaisthesecond_____populationintheworld? A.most B.largest C.more D.longest16.Ourcountryisbecoming________. A.morebeautifulandbeautiful B.moreandmorebeautiful C.morebeautifulandmorebeautiful四、選擇最佳的答案完成下文。DearDr.BamfordIknowyouareafamousscientistwhohasdonegreatworkoncloning(克隆)animals.Pleaseexcusemeforwritingtoyou,butIneedyour1.Letmeexplain. Iama58-year-oldman.I’mveryrich.Iliveinalargehouse.Mywifediedthreeyearsago,wedidn’thavechildren.So,amI2?No,becauseCindyiswithme.EverynightweeatdinnertogetherandwatchTV.Cindysitsbesideme3Ifeelveryhappy.I’mfascinated(著迷的)withbeautifulgreeneyes.She’salsoverysmart.Sometimesshethinksonlyaboutherself.Butthat’swhatI4abouther.SheisquiteabeautifulSiamesecat.Thereisnoothercatlikeherinthewholeworld.ThesedaysIworryabout5Cindy.Sheisgettingolderandolder.Catsdon’tlive6humans,ofcourse,soshewilldiebeforeIdo.Icannotimaginemylife7Cindy.Well,whynotgetanothercatafterCindydies?8!Noothercateverreplace(替代)her.Ihavebeenthinkingaboutthis:CloneCindy.Scientistsareabletoclonesheepandmiceandotheranimals.Theyshouldbeabletoclonecatswithoutmuch9.Luckily,Iamarichman.Idon’tcarehowmuchmoneyIwillspendcloningCindy.Ithink10toclonepets.It’snotcloninghumans.Whatdoyouthink?CouldyoucloneCindy?Sincerely,Arichman()1.A.cat B.animals C.help()2.A.lucky B.lonely C.happy()3.A.but B.and C.or()4.A.like B.hate C.mind()5.A.feeding B.catching C.losing()6.A.ashardas B.sooftenas C.solongas()7.A.with B.without C.about()8.A.Certainly B.Impossible C.Really()9.A.difficulty B.advice C.hope()10.A.it’st