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Keliling = 2 x π x r
atau
π x d
r = jari jari
d = diameter
π = 22/7 atau 3,14
phi = 22/7 atau 3,14
R = Jari- jari
Kuadrat =bilangan berpangkat 2
2. Keliling lingkaran = 2 x Phi x R
sekian.. semoga membantu :)