A1=6*2=12cm2;  A2=5*2=10cm2, A1=7*2=14cm2;  A2=6*2=12cm2, A=A1+A2=22cm2, A=A2+A1=26cm2, Xs1=3cm;  Xs2=3cm, Xs1=1cm;   Xs2=4,5cm, Ys1=1cm;  Ys2=4,5cm, Ys1=3cm; Ys2=3cm, Sx1=A1*ys1=12cm3, Sx1=A1*xs1=36cm3, Sy1=A1*xs1=36cm3, Sy2=A2*xs2=30cm3, Sy1=A1*ys1=42cm3, Sy2=A2*ys2=45cm3, Sx2=A2*ys2=45cm3, Sx2=A2*xs2=30cm3, ∑Sxi=Sx1+Sx2=57cm3, ∑Syi=Sy1+Sy2=66cm3, ∑Sxi=Sx2-Sx1=6cm3, ∑Syi=Sy2-Sy1=3cm3, ys=∑Sxi/A=2,59cm, ys=∑Syi/A=5,5cm, xs=∑Syi/A=3cm, xs=∑Sxi/A=2,54cm.

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