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b=2
h=3
P= (a+b) * h /2
P= (5+2) * 3 /2
P= 7*3/2
P= 21/3
P=7 j kwadratowych
P=1/2 x (a + b) x h
P= 1/2 x (5 + 2) x 3
P= 1/2 x (7 x 3)=1/2 x 21=10 i 1/2
mam nadzieję,ze jest zrozumiale to obliczenie,jesli nie bardzo to napisz