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B --> P = a*h / 2 = 3*1 / 2 = 3 / 2 = 1,5
C --> P = a*h / 2 = 2*3 / 2 = 6 / 2 = 3
D --> P = a*h / 2 = 3,5*2 / 2 = 3,5
E --> P = a*h / 2 = 1*2 / 2 = 1
PS Wszystko idealnie rozpisane i zrobione. Z gory dziekuje bardzo za naj :))