What is total surface area of a cone where, r’ is radius and ‘l’ is slant height?   

The area of an equilateral triangle inscribed in a circle is  . The area of the circle is:

The height of a wall is six times its width and the length of the wall is seven times its height. If volume of the wall be 16128 cube m, its width is 

A hollow iron pipe is 21 cm long and its exterior diameter is 8 cm. If the thickness of the pipe is 1 cm and iron weights , then the weight of the pipe (π) is. 

The wooden box measure 20 cm by 12 cm by 10 cm. Thickness of wood is 1 cm. The volume of wood to make the box (in cubic cm) is 

The volume of a cube is . Its surface area (in sq cm) is 

The area of square field is . Its diagonal will be equal to (use √2 = 1.414) 

What is the total CSA of cone whose radius is 3 cm and height is 4 cm?