Exercise 1

The area is measured correct to the nearest

The volume is measured correct to the nearest

The slant height of a right circular cone is $10 \mathrm{m}$ and its height is $8 \mathrm{m}$. Find the area of its curved surface?

A cylindrical pillar is $50 cm$ in diameter and $3.5 m$ in height. Find the cost of painting the curved surface of the pillar at the rate of $₹10$ per $m^2$.

Find the total surface area (in $c{m}^2$) of a right circular cylinder of diameter $21 cm$and height $10 cm$.

The circumference of the base of a right cylinder is $33 \mathrm{cm}$ and height is $330 \mathrm{cm}$. What is the volume of this cylinder?

A rectangular pipe $1.6 \mathrm{m}\times 1.5 \mathrm{m}$ pumps water at a speed of $20 \mathrm{km}/\mathrm{h}$ into a tank measuring $100 \mathrm{m}\times 80 \mathrm{m}$. In how much time (in minutes) will the water rise by $2 \mathrm{m}$?

How many spherical bullets, each bullet being $7 \mathrm{cm}$ in diameter, can be made out of a cube of lead whose edge measures $77 \mathrm{cm}$? $\left(\mathrm{Take} \mathrm{\pi }=\frac{22}{7}\right)$