What is the total surface area of a pyramid whose base is a square with side 8 cm and height of the pyramid is 3 cm? 

The base of a right pyramid is a square of side 10 cm. If its height is 10 cm, then the are (in cm²) of its lateral surface is:

A square and an equilateral triangle are drawn on the same base. the ratio of their area is

What is a point at equidistant from the vertices of a triangle called?

Find the number of diagonals of a regular polygon, sum of whose interior angles is 2700⁰.

If the numerical value of thes perimeter of an equilateral triangle is  $$ \sqrt {3}$$ times the area of it, then the length of each side of the triangle is

A cylindrical roller made of iron is 1.2 m long. Its internal radius is 24 cm and thickness of the iron sheet used in making the roller is 15 cm. What is the mass (in kg) of the roller, if 1 cm³ of iron has 8 g mass?

A metallic solid spherical ball of radius 3 cm is melted and recast into three spherical balls. The radii of two of these balls are 2 cm and 1.5 cm. What is the surface area (in cm²) of the third ball?