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kll1:kll2 = 1:2
kll2 = 2 kll1
kll2 = 2*30 cm
kll2 = 60cm
L1:L2 = phi*r*r : phi*2r*2r
L1:L2 = 1:4
L2 = L1*4
L2 = 25 cm^2*4
L2 = 100 cm^2
gampang kan? tinggal pakai trik perbandingan aja.
semoga membantu..... :)