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49 = a do kwad.
a = 7
h = 3 + a
h = 3 + 7
h = 10
Pc = 4*Pb + Pp
pC = 4 * 1/2 * a * h + a do kwadr.
Pc = 2 * 10 * 7 + 49
Pc = 140 + 49
Pc = 189