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a) P = π*9² + π*9*41= 450π cm²
b) P = π*9² + π*9*15 = 216 cm²
c)obliczam l z tw pitagorasa
15² + 20² = l²
225 + 400 = l²
625 = l
25 = l
P = π*15² + π*15*25 = 600 cm²