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13.3.2 ??????2?

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1?????ABC???C=90�?AC=3??B=30�??P?BC???????AP?????

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A? 3.5B?4.2

?1? ?2??3?

2??????ABC???B=30�?BC???????AB?E????D??ED=5??CE

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A? 10 B? 8 C? 5 D? 2.5 C? 5.8D? 7

3????Rt?ABC???C=90�???B???????????????ABC??????

?E?F?????E??F????????????????????M????BM??AC??D???BDC????10??ABC=2?A???ABC????? ?

A? 25 B? 30 C? 35D? 40

4??Rt?ABC???C=90�??B=30�???AB???2cm??AC??? ?

A?4cm B? 2cmC? 1cmD?m

5?????ABC???ACB=90�?CD????A=30�??BD?AB????? ?

A? BD=AB B? BD=AB C? BD=AB D? BD=AB

?5? ?6??7? ?8?

6????????????????BC?????AC?AB=10m??A=30�????BC

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A? 5m B? 8m C? 10m D? 20m

7??????????????????3???????????????30�???

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A? 6?B? 9?C? 12? D? 15?

8???????ABC=60�?DA?BC???????BE???ABD?AD??E???CE??

??????BE=AE??BD=AE??AE=2DE??S?ABE=S?CBE?????????? ?

A? ??? B? ??? C? ??? D? ???

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9?????Rt?ABC???ACB=90�?AB??????DE?AC?E??BC?????

F???F=30�?DE=1??BE????

10?????AOE=?BOE=15�?EF?OB?EC?OB??EC=1??EF=?

11??????ABC???C=90�??B=60�?AB=10??BC???

12??????????ABC??AB=AC=12cm??ABC=30�??????AD=cm?

?9? ?10??11? ?12?

13??????ABC??AB=BC??B=120�?AB???????AC??D??AC=6cm?

?AD= _________ cm?

?13? ?14??15? ?16?

14??????ABC???B=90�??BAC=30�?AB=9cm?D?BC????????AC=DC??

AD=cm?

15????????????????????AB?CD??????????????

?????????ABC=150�?BC????12????????B??C?????h?? _________ ??

16???ABC????AB=4?BC=10??B=30�???S?ABC=?

17?????ABC???????AD?BC?DE?AC??AB=12cm??CE=?

18?????????????A??????15�????P?????20????B

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19??????ABC???C=90�?AD???CAB??CB??D???D?DE?AB??E??1?

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20??????ABC??BA=BC??B=120�?AB??????MN?AC?D?

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21?????ABC???C=90�??ABC=60�?BD???ABC??AD=6??AC???

22?????ABC???ACB=90�?CD??ABC????A=30�?AB=4??BD??

23???????MAN=120�?AC???MAN?B?D?????AN?AM??

?1????1?????ABC=?ADC=90�?????AD+AB=AC?

?2????1?????�?ABC=?ADC=90��???ABC+?ADC=180�???????????2??????1?????????????????????????????????

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21?????ABC???C=90�??ABC=60�?BD???ABC?

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???2014????????????????????13.3.2?????(2)

13.3.2??????2??????

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1?????ABC???C=90�?AC=3??B=30�??P?BC???????AP?????? ?

A? 3.5 B? 4.2 C? 5.8 D? 7

?1? ?2??3?

2??????ABC???B=30�?BC???????AB?E????D??ED=5??CE???? ?

A? 10 B? 8 C? 5 D? 2.5

3????Rt?ABC???C=90�???B???????????????ABC???????E?F?????E??F????????????????????M??? ?BM??AC??D???BDC????10??ABC=2?A???ABC????? ?

A? 25 B? 30C? 35 D? 40

4??Rt?ABC???C=90�??B=30�???AB???2cm??AC??? ?

A?4cm B? 2cmC? 1cmD?m

5?????ABC???ACB=90�?CD????A=30�??BD?AB????? ?

A? BD=AB B? BD=AB C? BD=AB D? BD=AB

?5? ?6??7? ?8?

6????????????????BC?????AC?AB=10m??A=30�????BC????? ?

A? 5m B? 8m C? 10m D? 20m

7??????????????????3???????????????30�?????????????? ?

A? 6?B? 9?C? 12? D? 15?

8???????ABC=60�?DA?BC???????BE???ABD?AD??E???CE????????BE=AE??BD=AE??AE=2DE??S?ABE=S?CBE?????????? ?

A? ??? B? ??? C? ??? D? ???

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11??????ABC???C=90�??B=60�?AB=10??BC???

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?1. ????ABC???????AE?BC?E?AD?CD?D??AB?CD????60�???_____??

?2. ????????????????????????????????+??????? ?

A. 180� B. 220� C. 240� D. 300�

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?4. ????ABC??????D??BA?????????CD??CD????????CDE???AE???AE?BC????????????

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A???????

1?????????????????????????????????2cm???????????? ?cm?

A? 30 B? 40 C? 50 D? 60

2?????ABC??AB=AC??DEF???????????????????? ?

A?

B?

C?

D?

3???????ABC????4?AD?BC??????F?AD??????E?AC??????AE=2??EF+CF?????????ECF????? ?

A? 15� B? 22.5� C? 30� D? 45�

4?????ABC???????P?BC??????PD?AB?PE?AC???DE???ADE????L1????BDEC????L2??L1?L2??????? ?

A? Ll=L2 B? L1?L2 C? L2?L1 D? ????

5?????ABC????5????????E?AC????F?AB???ED?BC??ED=AE?DF=AF??CE???? ?

A? B?

C? 20+10 D? 20?10

6??????????????????????????????????????????????????????????????????????? ?

A? ??????? B? ??????? C.??? D? ???

7?????????ABC????P???P????????????S?Q?R??PQ=6?PR=8?PS=10???ABC?????? ?

A? 190 B? 192 C? 194 D? 196

8?????2cm?????????????????????????????????1cm?????????????? ?

A? 4? B? 5? C? 6? D? 7?

9?????????ABC????P?P???ABC????P?BC?CA?AB????????h1?h2?h3????h2+h3?h1=6??????ABC????? ?

A? 12 B? 9 D? 4

10???????ABC??????P?BC?????PM?AB?PN?AC?????AMPN??ABC??????m?n???? ?

C? 8


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