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jari-jari lingkaran B = 2r
LA : LB
π x r₁² : π x r₂²
π x r² : π x (2r)²
r² : 4r²
1 : 4
LA : LB = π rA² : π rB²
= rA² : rB²
= rA² : (2 rA)²
= rA² : 4 rA²
= 1 : 4