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2.phi.r1 : 2.phi.r2
2. luas1 : luas2
phi.r1^2: phi.r2^2
k2:k1
r2:r1
ket: r1=jari jari 1
r2=jari jari 2
rumus perbandingan luas lingkaran:
L2:L1
r2^2:r1^2
keterangan tanda ^2 berarti pangkat 2