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r1 = 10 cm
r2 = 20 cm
dit : perbndingn luas
maka :
L1 : L1
π x r1² : π x r2²
10² : 20²
100 : 400 (kedua ruas dibagi 100)
1 : 4
=3,14 x 100
=314
L2=3,14 x (20)^2
=3,14 x 400
=1256
L1:L2
314:1256
1:4