Question

The curvendSurface arear Of a right circular cone Of of height 15 cm And base diameter 16cm

Answer 1

Step-by-step explanation:

Given,

\: \: \: \: \: \: \: \: d = 16cm \\ = > r = 8cm \\ \\ \: \: \: \: \: \: \: \: h = 15cm

As we know that,

\: \: \: \: \: \: \: \: l = \sqrt{ {r}^{2} + {h }^{2} } \\ = > l = \sqrt{ {15}^{2} + {8}^{2} } \\ = > l = \sqrt{225 + 64} = \sqrt{789} \\ = > l = 17cm

Now,

C. S. A \: \: of \: \: cone = \pi \: rl \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{22}{7} \times 8 \times 17 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 427.43 {cm}^{2}.