A metal sheet of breadth 10 cm is used to make a cone of radius 14 cm and slant height 20 cm. Then length of sheet if 25% of sheet is wasted is .
A metal sheet of breadth 10cm is used to make a cone of radius 14cm and slant height 20cm. Then length of sheet if 25% of sheet is wasted is .
A closed hollow cone 24 cm high having base radius 7 cm is to be made using metal sheets. Find the capacity of the cone and the amount of sheet required to make the cone.
A bucket made of aluminium sheet is of height 20 cm and its upper and lower ends are of radius 25 cm and 10 cm respectively. Find the cost of making the bucket if the aluminium sheet costs Rs. 70 per 100 cm2. (Use π = 3.14).