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L = π × r × r
= π × r²
Rumus keliling lingkaran
K = 2 × π × r
Rumus diameter lingkaran
d = 2 × r
Keterangan :
L = Luas lingkaran
π = atau 3,14
r = jari-jari lingkaran
K = Keliling lingkaran
d = diameter lingkaran