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H=2,5m =250cm
Pc=2πr² +2πrH
Pc=2*4²π =2*4*250π =2*16π +2000π =32π+2000π
Pc=2032π cm²
d średnica 8cm , czyli promień r = 4cm = 0,04m (1m = 100 cm)
H = 2,5m
Pc = 2*π*0,04² + 2*0,04*2,5*π =0,0032π+0,2π = 0,2032πm²