Diketahui luas permukaan A = 616 cm2 dan luas permukaan bola B = 5.544 cm2. tentukan perbandingan ja.... Question from @Ayujuntak

September 2018 2 42 Report

giovanipatricia A = 616 cm^2
4 π r^2 = 616 cm^2
4 . 22/7 . r^2 = 616 cm^2
88/7 r^2 = 616 cm^2
88 r^2 = 4312 cm^2
r^2 = 49 cm^2
r = 7 cm

B = 5.544 cm^2
4 π r^2 = 5.544 cm^
4 . 22/7 . r^2 = 5.544 cm^2
88/7 r^2 = 5.544 cm^2
88 r^2 = 38.808 cm^2
r^2 = 441 cm^2
r = 21 cm

perbandingan jari2 = 7 : 21 = 1:3

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acim $\frac{R_{1}^2 }{ R_{2}^2} = \frac{L_{1}}{L_{2}} \\ \\ \frac{R_{1}^2 }{ R_{2}^2} = \frac{616}{5544} = \frac{1}{9} \\ \\ (\frac{R_{1}}{ R_{2}})^2 = ( \frac{1}{3})^2 \\ \\ \frac{R_{1}}{ R_{2}} = \frac{1}{3}$

dengan R1 dan R2 = jari-jari masing-masing bola

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Diketahui jari-jari tiga bola nerturut-turut 1dm,2dm,3dm. jika luas permukaan ketiga bola berturut-turut dinyatakan dengan L1 , L2, dan L3, tentukan L1 : L2 : L3 tanpa menghitung terlebih dahulu L1 , L2 , dan L3

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