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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