[ASK] Two Cones Azis wants to make two cones using cartons. The surface area of the first cone is twice the second. The side length of the first cone is also twice the second. Determine the ratio of those cones' radius! s1 = 2s2 L1 = 2L2 πr1(r1 + s1) = 2πr2(r2 + s2) r1(r1 + 2s2) = 2r2(r2 + s2) I was stuck with quadratic equations... 
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According to Google's translator, "luas permukaan" means "surface area" (as distinct from "total surface area"). Although a more specific phrase is available, it's possible that the need for it was overlooked. 
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