Answer: (i) 628 cm² (ii) 1356.48 cm² (iii) 1984.48 cm³
Slant height \(l=\sqrt{h^2+(r_1-r_2)^2}=\sqrt{36+64}=10\) cm.
(i) CSA \(=\pi(r_1+r_2)l=3.14\times20\times10=628\) cm²
(ii) TSA \(=\) CSA \(+\pi r_1^2+\pi r_2^2\)
\[=628+3.14(196+36)\]
\[=628+728.48=1356.48\ \text{cm}^2\]
(iii) \(V=\tfrac13\pi h(r_1^2+r_2^2+r_1r_2)\)
\[=\tfrac13\times3.14\times6\times(196+36+84)\]
\[=6.28\times316=1984.48\ \text{cm}^3\]