12. A 15 m tall pillar consists of two parts as shown in Fig. 16.4.
The diameters of the base at the bottom and the top-most
circular disc are in the ratio 4:3. If the total area of the curved
surfaces of both the parts of the piller is 110 m², find the
radius of each portion of the pillar,
N
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It is from your textbook.
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