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P=½*a*h
P=½*7*3
P=½*21
P=10,5 cm²
:)
a=28/4=7
h=3
P=3*7=21
Pole wynosi 21 cm²
P = a * h
a = 7cm
h = 3cm
P = 7cm * 3cm = 21cm²
Odp : Pole rombu jest równe 21cm²