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P: (a+b)*h /2
w tym przypadku wzor wyglada tak :
(a+2+b+2)*3h /2
(a+b+4)*3h /2
(a+b+12)*h /2
(a+b+6)*h <--- w ten sposob doszedlem do wyniku z odpowiedzi ;)
P2=(a+2+b+2)3h/2
P2= (a+b+4)3h/2
P2-P1=(a+b+4)3h/2 - (a+b)h/2= 3ah+3bh+12h/2 - (ah+bh)/2= 3ah+3bh+12h-ah-bh/2= 2ah+2bh+12h/2= h(a+b+6)