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Question

The radius and height of a cone are in the ratio 4: 3. The area of the base is 154cm2. The area of the curved surface is ___ cm2.


Solution

rh = 43

Base area = πr2=154

r=7cm  so h=34×7=214

l=(h2+r2)=354

So, curved surface area = πrl

  227×(7)×354=192.5 cm2


Mathematics

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