Base of a right pyramid is a square. The length of diagonal of the base is cm. If each lateral surface of the pyramid is an equilateral triangle, then its volume (in cu.cm) is

What is the area of an equilateral triangle having altitude equal to cm.

A spherical ball of lead 3 cm in diameter is melted and recast into three spherical balls The diameter of two of these are 1.5 cm and 2 cm respectively. The diameter of the third ball is 

If the curved surface area of a right circular cone is 10010 sq cm and its slant height is 91 cm, find its total surface area.

In a triangle, ABC, P and Q are points on AB and AC, respectively, such that AP = 1 cm, PB = 3 cm, AQ = 1.5 cm, and CQ = 45 cm. If the area of ΔAPQ is 12 , then find the area of BPQC.

The volume of a prism is 288cm³ and height is 24cm. The area of the base of the prism (cm²) is:

The diameter of a roller is 84 cm and its length is 120 cm. It makes 500 complete revolutions to move once over to level a playground. Find the area of the playground.

The radii of three concentric circles are in the ratio of 4 : 5 : 7. What is the ratio of the area between the two inner circles to that between the two outer circles?