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4. Two similar cones have radii 3 cm and 9 cm. Let r_1 = 3 cm (smaller cone) and r_2 = 9 cm (larger cone). 4.a) Find the scale factor. The scale factor k is the ratio of corresponding linear dimensions. We'll use the ratio of the larger radius to the smaller radius. k = (r_2)/(r_1) = 9 cm3 cm = 3 The scale factor is 3. 4.b) If the smaller cone has volume 40 cm^3, find the volume of the larger cone. For similar solids,