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Verified answer
Bab Bangun RuangMatematika SMP Kelas VIII
Bola
Luas Permukaan a : luas permukaan b
= (4 x π x ra x rb) : (4 x π x rb x rb)
= (ra)² : (rb)²
= (ra : rb)²
= (3 : 4)²
= 9 : 16