Find the approximate volume of metal in a hollow spherical shel, whose internal and external radii are 3 cm and 3.0005 cm respectively.

Find the area of rectangle whose length and breadth are 12 cm and 4 cm respectively.

Find the area of the rectangle whose sides are 10 cm, 12 cm respectively.

Find the surface area of cuboid whose length, breadth and height are 20 cm, 10 cm and 8 cm respectively.

A container made up of a metal sheet is in the form of a frustum of a cone of height 16 cm with radii of its lower and upper ends as 8 cm and 20 cm respectively. Find the cost of the metal sheet used, if it costs Rs 5 per 100 cm2.

A container opened from the top and made up of a metal sheet, is in the form of a frustum of a cone of height 16 cm with radii of its lower and upper end as 8 cm and 20 cm, respectively. Find the cost of made which can completely fill the container, at the rate of Rs 20 per litre. Also find the cost of metal shape used to make the container, if it costs Rs 8 per 16cm^(2) . (Take pi=3.14 )

Find the volume of sphere whose radius is 3 cm

Find the volume of a hemispherical of radius 3.5 cm.

The internal and external diameters of a hollow hemispherical shell are 6 cm and 10 cm respectively.It is melted and recast into a solid cone of base diameter 14 cm. Find the height of the cone so formed

The area of a circle is equal to the sum of the areas of the two circles, whose radii are 5 cm and 12 cm respectively. Find the radius of the circle.