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π x r1 x r1 : π x r2 x r2 (π bisa dicoret karena sama)
r1 x r1 : r2 x r2
20 x 20 : 15 x 15
400 : 225
16 : 9
jadi perbandingan luasnya 16 : 9
:
3,14 × 20² : 3,14 × 15²
3,14 × 400 : 3,14 × 225
1256 : 706,5