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r(kwadrat)π =36π /:π
r(kwadrat)=36
r=6
obw= 2rπ
6*2π =12π
P = 36 π cm²
π r² = 36 π/π
r² = 36
r = √36
r = 6 cm
Obw kola 2π r
Obw 2π * 6 = 12 π cm
:)