1、 1 1 1.sin45 0 A. 1 2B. 2 2C. 3 2D. 1 2. AB i AB A 3. A. B. C. D. 4. AB=2DE AC=2DF 16 12 A 8 3 B 8 6 C 4 3 D 4 6 5. 0 BD CE F A. 6 B. 7 C. 8 D. 9 6. BD AD AC 2 A. 1 2B. 51 2 C. 1 D. 51 2 7. 1B1C1 11 AB AB A. 1 2B. 2 2C. 1 3D. 3 38. AB/CD AE/FD AE FD BC G H A. 4 B. 5 C. 6 D. 7 9. AC P P A C P A 1 B 2
2、 C 3 D 3 4 10. 3cm A. 2 33 4 cm B. 2 93 8 cm C. 2 93 4 cm D. 2 27 3 8 cm 11. D E 3 12. S3 S4 S6 S3 S4 S6 . 13. a 14. ABC D E AB BC AD=BE AE CD F G AG AF 15. ABCD AC BD O . 16. 1 D ABC AB CN AB DN AC M MA=MC 1 CD=AN 2 AMD MCD ADCN 4 17. E C D 1 2 OC=OD 3 OE CD 18. A M 20 1 B M D M 0.1 3 5 19. A B C A
3、 C B B A 100 C 20. AB 123m A C 45 0 D 30 0 CD 0.1m 3 1.73 6 21. 30 60 66 m 0.1 m 73 . 1 3 22. 12.6 ED AB 1 1 AB ED BC=2.4 DF=7.2 AB 2 h AB 2 m AB 7 23. ABCD AD i 1 1.2 5 . CD 1 EF 1 1.4. 4000 . 1 2 20 . . 30% 40% 5 . 8 24. a b c a 2 b b c 2 ABC a 2 b b c 9 AC BC=1 2.5=0.4 B 3. A. B. C. D. B SSS SAS
4、AAS ASA HL AAS ASA 10 B SAS SSA SSA C SSS D SSS B 4. AB=2DE AC=2DF 16 12 A 8 3 B 8 6 C 4 3 D 6 A EF F 2 AB=2DE AC=2DF AB AC 2 DE DF 2 16 12 A 5. 0 BD CE F A. 6 B. 7 C. 8 D. 9 D 00 180 36 2 1 2 11 CD=CF 8 D 6. BD AD AC A. 1 2B. 51 2 C. 1 D. 51 2 B C CD BC BC AB AC AD AD AC AD 1 AD AC AD AC AD AC x 2
5、1 1 5 1 1=0 = 2 x x x x x 15 = 2 x 15 2 AD 5 1 = AC 2 x B 7. 1B1C1 11 AB AB 12 A. 1 2B. 2 2C. 1 3D. 3 3 A 1B1C1 O AB A1B1 OA OA1 AB A1B1 1B1C1 O AB A1B1 D E OA OA1 R OD=R OD R = 3R tan OAD 3 3 AB=2 3R A1B1= 3R 11 AB 3R 1 AB 2 2 3R A 8. AB/CD AE/FD AE FD BC G H A. 4 B. 5 C. 6 D. 7 C 13 6 C 9. ABC AC
6、P P A C P A 1 B 2 C 3 D 3 4 D P 1 AC BC 1 P PD1 PD2 PD3 4 4 2 AC BC PC BC 2 1 PD1 PD2 PD3 4 D4 CB 3 3 AC BC PC BC 3 1 PD1 PD2 PD3 PD4 4 4 AC=BC 4 1 PD1 PD2 PD3 4 PD4 PD3 3 3 4 D 4 D2 D1 D3 P B C A 3 2 1 D1 D2 D3 D4 B C P A P D2 D1 D4 D3 B C A D1 P B D3 D2 C A10. 3cm A. 2 33 4 cm B. 2 93 8 cm C. 2 93
7、 4 cm D. 2 27 3 8 cm 14 B 3cm D F AB F DE O OE OF OG H AB=3 AD=DE=EB OE=1 0 0 0 3 OF OE sin60 = 2 0 3 OH OF sin60 = 4 OGF 1 3 3 3 3 S 2 2 4 16 3 3 9 3 6= 16 8 B 11. D E 68 - - - 12. S3 S4 S6 S3 S4 S6 . S6 S4 S3 H G F E D C B A O 15 O F E D C G B A D C B A C D B A 1 2 3 a 2a ABCD 3 2 a 1 A D BC=2a a
8、2 2 2 2 AD AB BD 2 3 a a a 2 3 ABC 11 S S BC AD 2 3 3 22 a a a 2 ABCD 3 2 a 2 22 4 ABCD 39 S S AB 24 aa 3 O G ABCDEF 360 BOC 60 6 BG 3 2 OG tan30 2 3 3 a a 2 BOC 1 3 3 S 2 2 4 a a a 22 6 BOC 3 3 3 S 6S 6 42 aa 22 3 48 S 3 = 16 aa 22 4 9 81 S= 4 16 aa 22 6 3 3 216 S 2 16 aa 6 S4 S3 13. a 2a 16 2 3 3 2 a 3 2 a = 0 3 3 2 =2 tan30 a a 14. ABC D E AB BC AD=BE AE CD F G AG AF 3 2 C SAS 0 C H 1 2 0 0 =60 0 30 0 =30 0 GF 0 AG 3 =cos FAG=cos30 = AF 2 15. ABCD AC BD O .