10 1

ABCDE P - PA, PB, PC, PD, PE PAB, PBC, -

2 PAEDCBFOPABCDEF , :ABCDEF PO O ABCDEF

(. . ), .S = S + S

5PNOA1A2AnA3

: - SABC . , AB=8, CSB=: SO - ? 255

7HKCAB: ABC, AB=a: h, r, R, S, HK - ? ABCD1091313: DABC - AB=AC=13 , BC=10 , AD(ABC), AD=9 . S:1. AKBC, BCDK, DK DBCK2. ABK : AK2=AB2-BK2AK=12 . 3. ADK : DK2=AD2+ AK2DK=15 . 4. ADB=ADC, S=2SADB+SBDC;S=13*9+5*15=117+75=192 c2.243

: SABCDEF - . AB=a, SASF=SASD SSASF=0,5*SK*AF, AF = aSASD=0,5*AD*SO, AD = 2aSASF=SASD, SK=2*SO SKO=30

SK = a, S= 3a226410

: SABC ABC - AC B=120, SO (ABC) SO=16 ASO=45 S:

25011

K: SABCD- SO (ABC), SKBC, S=6,

:) ) (BSC, ABC)) (BS, ABC)) S) S12