.:..

.:1:2.OD

;.:..PA,PBOA,B PA=PB 1=2

,,.

2ABCOABCO AOC=140 B3.PO6cm,2cm,O_______.DACDADCD. AOC=140 D=70 B=180 70 =110 24cm

IABCABBCCADEFDEF50A

(2)

4.

ABCP5 ABOOCABP CP=7cmAB=28cm O714

:1.,O,ABCD,:AC=BDC,AC=BC

2.,ABCABOBCD,:OCBADDBC.

OPBADC3.,PAPBOA,B,ABEO,PA,PBC,D,:(1) PCD=2PAE

DFEDFE4., ABCODEF.

5.Rt ABC, ACB,abc,r,:r=r=

6.,ABO,AD,BC,DC,:(1)DC=AD+BC(2) DOC=900

:1., OAB=12,OAO1ACD,DOCE,ABF.EO1ODCBAF(2)DFOC,.(1)DAC.(3)DF=4,OF.

2.,ABCD2,PBC.ABO,POADF,E.DCBAFPOE(1)CDFP.(2)BP=x,AF=y,yx.Q

2.PAOAPA= , APO=30PO A. B. 2 C. 1 D.3.ABADDCOBEC ABCDAOD A. B. C. D.

4.ABCDOADBC B=60C=45O 10 A.10 B.20 C. D.

13 cm4 cmBCBC=_____ cm22OABPAB=12_____3 A. B. C. D.

1 ABOACOAAPO:CAP=B ABOACOA ABOCAB=90P=9011+CAP=901+B=90CAP=B AOOD,PDCAP=D,D=B,CAP=B

2,RtABC,BCA=90,BCOABP,QAC.PQO,.PQOOPCPBCOBPC=APC=90RtACP,QACPQ=CQ1=2OP=OC3=4BCA=901+3=902+4= 90OPPQ(OPO) PQOOPOQ

3.,,D(0,1),DyAB,xC,C:y=2x4yP.PCD.PCESEOC=4SCDO,E. x=0y=-4;y=0,x=-2C(-2,0), P(0,-4)D(0,1)OC=2, OP=4 ,OD=1, DP=5RtCOD, CD2=OC2+OD2=4+1=5RtCOP, CP2=OC2+OP2=4+16=20CPD, CD2+CP2=5+20=25, DP2=25CD2+CP2=DP2CDP,DCP=90PCD.y=-2x-4 PCO

PCE(x0,y0),SEOC =4S CDOEPCy=-2x-4y0=4 y0=-4PCE(-4,4) , (0,-4) .

ABOPOPAOBCOPPCO

1.BACO,AD CEAD,ABF. AC2=AFAB. G

2. ABOCDO ABCDE, AEC45, Or. EC2+ED2=2r2 .F

3.ABOCDABABH, OE,D, CBOF . CFE =DFB.

12

4.ABA C,DB E,F. ECFD.

5.ABCO,AB=ACBACBCDO9AB+AD=20AD.E

6.ABCDABCDB=90 AD=AB+DCADO. BCO.

7.AB=ACACOBC D,DEABE. DEO.

1ABO2ACD=450OC=2CD

6.24

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