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a) A=(3,4) B=(6,8) C=(-1,-3)
|AB|=√((3-6)²+(4-8)²)=√(9+16)=√25=5
|BC|=√((-1-6)²+(-3-8)²)=√(49+121)=√170
|CA|=√((3+1)²+(4+3)²)=√(16+25)=√41
Obw=5+√170+√41
b) A=(-2,1) B=(-5,7) C=(3,12)
|AB|=√((-2+5)²+(1-7)²)=√(49+36)=√85
|BC|=√((-5-3)²+(7-12)²)=√(64+25)=√89
|CA|=√((3+2)²+(12-1)²)=√(25+121)=√145
Obw=√85+√89+√145