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r1 = 10 cm
r2 = 15 cm
maka :
perbandingan :
L1 : L2
π x r1² : π x r2²
10² : 15²
100 : 225 ......dibagi 25
4 : 9
luas 1 = phi x 100
luas 2 = phi x r^2
luas 2 = phi x 225
luas 1 ; luas 2
100 : 225
4 :9