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f=40cm
P=ef/2=10*40/2=200 [cm²]
f=40
P=e*f/2
P=10*40/2
P=200 (j^2)
d2 = 10cm*4 = 40cm
P = 0,5*10cm*40cm
P = 0,5*400cm²
P = 200cm²