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17.1 (3)_






17.1
3



1.. Rt ABC,C=90 2 2 2 a a ? b ? c .
B

c
b A

C

2.261.

1.2.6 mAB AOAO2.4 m. A0.5 m B0.5 m





A

2.4 m

2.6 m

O

ŧ

OB=m

B

C

2.6 m 1.9 m

O

OD=? m

D

1. 262.

2 .8A 1510B .AC30B C60 C . C
B

AB=30,CAB=30 CBA60.
CB=AB=30

A

C .


C

NH
B

A

1 15 3

2 1 1 5 .

A



C

B

A

ACABAC 1.
x+1

x

C

5

B

ACx,AB x+1. ACB AB2=AC2+CB2 x+12=x2+52 . x=12. 12.

3. BC50 10 AC
A

C

B



A
x 50 x+10

C

B

ACx,ABx+10. ACBAB2=AC2+CB2 x+102=x2+502 . x=120. AC120.

4.17.110. 1 MF=MA
B F E A

2 10
D

C

M

AB=CD=10

4.17.110.
B F E A

C

M

D

EMx, AMx+1. AEM AM2=ME2+AE2 x+12=x2+52 . x=12. 12+1=13. 12 13.


1.AB2.5 A

ACBC 1.5DE BD0.5A
A E

C

B

D



2. 1 2

Ԧ . .


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