d(A(,), B(,)) = sqrt((x2-x1)^2+(y2-y1)^2) =

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višina = 2 * / =

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ploscina 3kotnika (A(,) B(,), C(,)) = = 0.5*o*((x2-x1)*(y3-y1)-(y2-y1)*(x3-x1))
orientacija: nasp.sm.ur.k.=poz.=1; sm.urin.k.=neg.=-1

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heronova ploščina 3kotnika (, , ) = 0.25 * Math.sqrt((a + b + c) * (-a + b + c) * (a - b + c) * (a + b - c)) =

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/ (nta) potenca od je .