unit3 as直线二次方程高级补充水平纯数学1p1coordinate geometryunit2坐标几何.pptx

unit3 as直线二次方程高级补充水平纯数学1p1coordinate geometryunit2坐标几何.pptx

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MathematicsUnit3

ASLinesandquadratics

AdvancedSupplementaryLevelPureMathematics1(P1)

CambridgeInternationalAASLevelMathematicsisacceptedbyuniversitiesandemployersasproofofmathematicalknowledgeandunderstanding.StudentsmustchoosePuremathematics1(P1)oroneofthefollowingsubjects: puremathematics2(P2),mechanics1(M1),ProbabilityandStatistics(S1).

Puremathematics11?hoursAbout10shorterandlongerquestions75marksweightedat60%oftotal

CoordinateGeometry

FindthedistancebetweenT(5,2)andR(-4,-1)tothenearesttenth.

ExampleFindtheperimeterof△ABC.

Exercise

ApplicationLocatethecentroidinthetriangletotheright.

ExtensionDistancein3DimensionsInathree-dimensionalcoordinatesystem,thedistancebetweentwopoints(xl,y1,z1)and(x2,y2,z2)canbefoundusingthisextensionoftheDistanceFormula.

ExerciseFindthedistancebetweeneachpairofpointstothenearesttenth.1.P(2,3,4),B(-2,4,9)2.Q(O,12,15),Y(-8,20,12)

Example

Exercise

Application

Equationsoflinesslope-interceptformy=mx+cgeneralformAx+By=Cpoint-slopeformy-y0=m(x-x0)interceptsform

Equationsoflinesparallelandperpendicular

Example:DecidingwhetherlinesareperpendicularLineh:y=?x+2Theslopeoflinehis?.Linej:y=-4/3x–3Theslopeoflinejis-4/3.Theproductof?and-4/3is-1,sothelinesareperpendicular.

Example:DecidingwhetherlinesareperpendicularLiner:4x+5y=24x+5y=25y=-4x+2y=-4/5x+2/5Slopeoflineris-4/5Lines:5x+4y=35x+4y=34y=-5x+3y=-5/4x+3/5Slopeoflinesis-4/5-4?-5=154TheproductoftheslopesisNOT-1;sorandsareNOTperpendicular.

ExaminationSyllabusfindthelength,gradientandmid-pointofalinesegment,giventhecoordinatesoftheend-points;findtheequationofastraightlinegivensufficientinformation(e.g.thecoordinatesoftwopointsonit,oronepointonitanditsgradient);understandandus

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