苏教版三年级上第三单元2.认识周长同步练习(含答案)

苏教版三年级上第三单元2.认识周长同步练习(含答案)Unit3-2UnderstandingPerimeterandSynchronousExerciseFirst,drawtheoutlineofthefollowingshapeswithcoloredpens.Next,fillintheblanks.1.Ifyouuseyarntogoaroundtheedgeofamapleleaf,thelengthoftheyarnisthe()ofthemapleleaf.2.Thecoverofamathbookisintheshapeofa(),andtofinditsperimeter,weneedtoknowitslengthof()cmandwidthof()cm.3.Using4squareswithasidelengthof1cm,wecanmakealargersquarewithasidelengthof()cmandaperimeterof()cm.4.Using9smallsquareswithasidelengthof1cm,wecanmakearectanglewithalengthof()cmandawidthof()cm.5.Youneedatleast()identicaltrianglestomakearectangleandasquare.6.Amongthefollowingshapesmadeof4squareswithasidelengthof1cm,theonewiththeshortestperimeteris().①②③7.Thefollowingshapesaremadeof30cmlongwires,andtheperimeterofeachshapeis()cm.Next,choosethecorrectanswer.1.ComparedtotheperimeterofshapeB,theperimeterofshapeAis().A.GreaterthanB.EqualtoC.Lessthan2.Ifasquareiscutintotworectangles,thesumoftheperimetersofthetworectanglesis()theperimeteroftheoriginalsquare.A.EqualtoB.GreaterthanC.LessthanFinally,solvethefollowingproblems.1.XiaoMingwrappedatreethreetimeswitha35-meterropeandhad8metersleft.Whatisthecircumferenceofthetree?2.Comparetheperimeterofeachpairofshapesandmark"√"iftheyareequal,ormark"×"iftheyarenot.3.Thinkabouthowyoucanfindtheperimeterofeachshapebelow.4.Whichofthefollowingshapeshasthelongestperimeter?Mark"√"inthe().①()②()③()5.Counttheperimeterofeachshapebelowincentimeters.Answers:1.Perimeter2.Rectangle,length,width3.2,84.9,15.26.7.303.B4.B4.