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Ptr- pole trapezu
h1+h2 = h
IMEI = a+b /2 ---- bo to długość linii środkowej trapezu
Ptr= a+b/2 × h
P(ΔDMC)=P(ΔDME) + P(ΔEMC)= ½ × IEMI × h₁ + IEMI × h₂ = ½ × IEMI ×( h1+ h2) = ½ × IEMI × h = ½ a+b/2 × h = ½ Ptr