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2 1 ABC , AB = AC : 3 .

:ABCbba

3 ABC , AB = AC : 3 .

ABCDb : AD - BC = a 3 b = 3a

a = BC BD= = DC ADC

: a b = 3a

2

- ABCD (D=90 , AB (DC. K BC - BC DK : AB2= DC , 3 '' = CK , 5 '' = BK.. C . .BCADKK35 2

- ' ABCD (D=90 , AB (DC. K BC - BC DK : AB2= DC , 3 '' = CK , 5 '' = BK.. C BCADK : BT DC : AB = b, C= 11T35b 2 '

- ' ABCD (D=90 , AB (DC. K BC - BC DK : AB2= DC , 3 '' = CK , 5 '' = BK.. C BCADK : BT DC : AB = b, C= 11T35b

. ABTD ( 3 ) AB=DT=b , DC=2AB=2b DT=TC=b bb

2 - '

- ' ABCD (D=90 , AB (DC. K BC - BC DK : AB2= DC , 3 '' = CK , 5 '' = BK.. C BCADK11T35bbb

. . 2 - '

' ABCD (D=90 , AB (DC. K BC - BC DK : AB2= DC , 3 '' = CK , 5 '' = BK.. C BCADK11T35b bb

. .(1) ' BTC

(1) BTC

9

PTGK TBAKGCPDL a ''

a - b b 310

PTGK TBAKGCPDL a ''

a - b b

bb

311

PTGK TBAKGCPDL a ''

a - b b

bb