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The cost of painting the total surface area of a cone at 25 paise per cm² is Rs.176. Find the volume of the cone, if its slant height is 25 cm.

Answer» 25 pasie = rs1/4
1/4rs = 1m^2
1rs = 4m^2
176 RS = 704 cm^2
TOTAL surface area of cone = πr (r+l)
πr^2+πl = 704
3.14×r^2+3.14×25 = 704
3.14r^2+78.5 = 704
3.14= 704-78.5
3.14r^2 = 625.5
πr^2 = 625.5


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