Question

the cost of painting the total surface area of cone at 25 Paisa per centimetre square is rate 176 find the volume of the cone if its slant height is 25 CM

Answer 1

Total surface area=total cost in paise/cost of one cm^2 area
i.e 176×100/25=704 cm^2
Now total surface area of cone is
Pi r^2 + pi r l = 704
Put value of l i.e slant height 25cm
Then value r will be 7
Now we have slant height 25cm and radius 7cm.
We have to find height of cone we will apply pythogaurus theorem
Height=
$\sqrt{l ^{2} - r ^{2} }$where l is slant height and r is radius of the cone
After put the value in above formula l=25 and r=7 we will get h= 24.
Now the volume of cone is =1/3pi r^2 h
i. e 1/3 pi×7^2 ×24= 1232 cm^3.

Answer 2

Heya...

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