Surface Areas a...

How many balls, each of radius $$1$$ cm, can be made from a solid sphere of lead of radius $$8$$ cm?

Savitri had to make a model of a cylindrical kaleidoscope for her science project. She wanted to use chart paper to make the curved surface of the kaleidoscope. What would be the area of chart paper required by her, if she wanted to make a kaleidoscope of length $$25\space cm$$ with a $$3.5\space cm$$ radius? You may take $$\left (\pi = \dfrac{22}{7}\right )$$

Three solid spheres of copper, whose radii are $$3$$ cm, $$4$$ cm and $$5$$ cm respestively are melted into a single solid sphere of radius R. The value of R is

Find the difference between total surface area & curved surface area of a hemisphere of radius $$21\space cm$$.

The diameter of a garden roller is $$1.4$$ m and it its $$2$$ m long. How much area will it cover in one revolution?

The diameter of the base of a right circular cylinder is $$28$$ cm and its height is $$21$$ cm Curved surface area of the cylinder is

The hollow sphere, in which the circus motorcyclist performs his stunts, has diameter of $$7\ m$$. Find the area available to motorcyclist for riding.

The diameter of a garden roller is $$1.4\space m$$ and it is $$2\space m$$ long. How much area will it cover in $$5$$ revolutions? (Use $$\pi = \dfrac{22}{7}$$)

A metal pipe is $$77$$ cm long The inner diameter of a cross section is $$4$$ cm then inner curved surface area is

Curved surface area of a right circular cylinder is $$4.4$$ $$\displaystyle m^{2}$$ If the radius of the base of the cylinder is $$0.7$$ m then its height is