问题标题：
【几道sat数学题1,Inthexy-coordinateplanewhatistheareaofthesquarewithoppositeverticesat(-2,-2)and(2,2)?2,QRPS是一个平行四边形.IfQR//PSinthefigureabove,whatisthevalueof2(x+y)?3,Inthexy-planeabove,theequationofl】
问题描述：
几道sat数学题
1,Inthexy-coordinateplanewhatistheareaofthesquarewithoppositeverticesat(-2,-2)and(2,2)?
2,QRPS是一个平行四边形.IfQR//PSinthefigureabove,whatisthevalueof2(x+y)?
3,Inthexy-planeabove,theequationoflinelisx+3y=12.Whichofthefollowingisanequationofalinethatisperpendiculartoline
A)y=x+2.B)y=-3x+2.C)y=3x-6.D)y=X/3+6.E)-x/2-3
4,FivedifferentpointsABCDandElieonalineinthatorder.ThelengthofADis4.5andthelengthofBEis3.5.IfthelengthofCDis2,whatisonepossiblevalueforthelengthofBC?
5,When1.783isroundedtothenearestwholenumbe,thrresultishowmuchgreaterthanwhen1.783isroundedtothenearesttenth?
沈掌泉回答：
16.
sincethecoordinatesoftwoapexesare(2,2),(-2,-2),wecaneasilyknowthattheothertwoapexes'coordinatesare(-2,2),(2,-2).therefore,wearesupposedtocalculatetheareaofasquarewiththelengthofsideequals4.4*4=16.
(seemsthatudidn'tuploadedthepicture...)
C
Wecanwritethegivenlineinthisway:y=-1/3x+4,thustheslopeofgivenlineis-1/3.Twolinesareperpendicularwhentheproductoftheirslopeisequalto-1.Therefore,theslopeofanotherlineshouldbe(-1)/(-1/3)=3.
0<BC<1.5
Theanswerisevidentifudrawoutthepicture.
0.2
1.783roundedtothenearestwholenumber:2;
1.783roundedtothenearesttenth:1.8;
2-1.8=0.2
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