If a well is dug 21m deep and 1.4m in radius, how much earth is dug out from it? If the inner wall of well is plastered at Rupees 20 per m^2 . WHAT WILL BE ITS COST ?


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Question Number 69347 by Askash last updated on 22/Sep/19

$I f a w e l l i s d u g 21 m d e e p a n d 1.4 m$ $i n r a d i u s, h o w m u c h e a r t h i s d u g$ $o u t f r o m i t ? I f t h e i n n e r w a l l o f$ $w e l l i s p l a s t e r e d a t R u p e e s 20$ $p e r m^{2} . W H A T WILL B E I T S$ $COST ?$
	Answered by MJS last updated on 22/Sep/19

	${it}^{'} s simply a cylinder$ $the volume is r^{2} π h$ $the lateral surface is 2 r π h$
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