Question

$\color{red} \sf \: 1) A\: right \: angle \: \triangle \: with \: sides \: 6 \: cm, \: 8 \: cm, \: and \: 10 \: cm \: is \: revolved \: about \: the \: side \: 8 \: cm .\: \\ \sf \color{red} \: Find \: the \: volume \: and \: curved \: surface \: area \: of \: the \: cone \: so \: formed. \: \: \{Take \: \pi \: = \: 3.14 \} \\ \\ \color{silver} \sf \: 2) \: The \: height \: of \: a \: cone \: is \: 30 \: cm. \: A \: small \: cone \: is \: cut \: off \: at \: the \: to p\: by \: a \: plane \: \\ \color{silver} \sf parallel \: to \: its \: base .\: If \: its \: volume \: be \: \: \frac{1}{27} \: \: of \: the \: volume \: of \: th e\: given \: cone, \: at \: what \: \\ \color{silver} \sf \: height \: above \: the \: base \: is \: the \: section \: cut \: ? \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:$
​

Answer 1

Answer:

volume=πr^2h

curved surface area = πrl