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|AB|=√(-3+6)²+(-3-1)²=√9+16=√25=5
|BC|=√(xc-xb)²+(yc-yb)²
|BC|=√(5+3)²+(3+3)²=√64+36=10
Jeśli jest to prostokąt to |AB|=|CD| i |BC|=|DA|. Ob= 2*10+2*5=30