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P=3×2,5/2
P=3,15cm²
a= 3 cm
P=ah/2
P=2,5*3/2=3,75 cm
/ kreska ułamkowa
* mnożenie
p = 3 razy 2.5 podzielic na dwa
p = 7.5 :2 = 3.75 cm kwadratowych