Jawabanmu

Jawaban paling cerdas!
2014-09-10T13:04:18+07:00
Jari-Jari Bola A =  r_{a}
Jari-Jari Bola B =  r_{b}
Jari-Jari Bola C =  r_{c}
Luas Bola A =  L_{a}
Luas Bola B =  L_{b}
Luas Bola C =  L_{c}

 r_{a} :  r_{b} = 3 : 4 = 9 : 12
 r_{b} :  r_{c} = 6 : 5 = 12 : 10
 r_{a} :  r_{b} :  r_{c} = 9 : 12 : 10

 L_{a} :  L_{b}  r_{a} ^{2} :  r_{c} ^{2} =  9^{2} : 10^{2} = 81 : 100

 L_{b} r =  \frac{ L_{b}}{ L_{a} } ×  L_{a} =  \frac{4}{3} × 36 = 48 cm^{2}

 L_{c} r =  \frac{ L_{c}}{ L_{b} } ×  L_{b} 
 =  \frac{5}{6} × 48= 40 cm^{2}