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terima kasih
kalau lingkaran
K = 2 π r
31,4 = 2πr
r = 31,4 : 2π
r = 31,4 : 2 x 3,14
r = 5
luas = π x r^2
= 3,14 x 5^2
78,5 cm^2
ini kalau yg diminta lingkaran ya..