Question

A containd made of a metal sheet is in the
form of frustum of a lone of height 12 cm with
radio of lower and upper ende 3cm and 12cm
respectively Find the cost of metal sheet used
of cost Re. I per 100 cm² . use = 22​

Answer 1

Answer:

$\huge{Answer}$

$\tt{Given :}$

$\tt{Height - 12 cm}$

$\tt{R - 12 cm}$

$\tt{r - 3 cm}$

$\tt{l^2 = ( R + r )^2 - h^2}$

$\tt{l^2 = (9)^2 - (12)^2}$

$\tt{l^2 = 81 + 144}$

$\tt{l^2 = 225}$

$\tt{l = 15 cm}$

$\tt{First we have to find C.S.A}$

$\tt{\green{C.S.A of Frustum =}}$

$\tt{π( R + r )l}$

$\tt{π ( 12 + 3 )15}$

$\tt{π × 15× 15}$

$\tt{225π cm^2}$

$\tt{For cost multiply it with CSA}$

$\tt{Cost = 225π × 100}$

$\tt{\green{Cost = 70, 685.83Rs.}}$

$\huge{May Help♡}$