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luas1 = luas2
4πr² = 4π(3r)²
r ²= 9r²
1 : 9
Lp1 = 4 ^ r2
= 4 x^ x1 x1
= 4^
Lp2 = 4 ^ r2
= 4 x^ x3 x3
= 36 ^
perbandingan = 4 : 36
= 1: 9