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pierwszy rząd
Pp=r²=5²=25cm²
Pb=πrl=π5*13=65πcm²
Pc=Pp+Pb=25π+65π=90πcm²
Drugi rzad
πrl=pb
r=Pb/πl r=14π/7π=2
Pp=πr²=π2²=4πcm²
Pc=Pp+Pb=4π+14π=18πcm²
Trzeci rzad
Pb=πrl
l=Pb/πr
l=3 5/9π/4π=8/9cm
Pp=πr²=π4²=16πcm²
Pc=Pb+Pp=3 5/9+ 16= 19 5/9 πcm²
Jak coś nie zrozumiale to pisz, liczę na naj