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2-ga przekątna - 150% * 7cm= 1,5*7cm = 10,5 cm
P= 1/2 * 7 cm * 10,5 cm =36,75 cm²
b = 10.5cm
P= axb/2
P= 7 x 10.5 / 2 = liczysz
7*10,5/2=36,75