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12,56 = 3,14 × d
d = 4 cm
r = 2 cm
Luas lingkaran = 3,14 × r × r
Luas lingkaran = 3,14 × 2 × 2
Luas lingkaran = 12,56 cm^2
K = 2 π r
12,56 = 2 x 3,14 x r
122,56 = 6,28 x r
r = 12,56 : 6,28
r = 2 cm
Jadi Luas lingkaran = π r²
= 3,14 x 2²
= 12,56 cm