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|AB|=5
|BC|²=(-3-1)²+(6-3)²=16+9=25
|BC|=5
|AC|²=(-3+2)²+(6+1)²=1+49=50
|AC|=5√2
ΔABC prostokatny (25+25=50) i rownoramienny.
Ob.=5+5+5√2=10+5√2
P=1/2*5*5=12,5