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2r=H
P=H²
H²=36cm²
H=√36
H=6cm
2r=6cm
Pb=2πrH
Pb=6*6π=36π cm²
P=36
a²=36
a=√36=6cm
zatem wysokosc walca H=a=6cm
srednica walca 2r=a
2r=6 /:2
r=3cm --->promien walca
czyli pole boczne walca wynosi:
Pb=2πr·h=2π·3·6=36π cm²