If two circles of radii 18 cm and 8 cm touch externally, then the length of a direct common tangent is:

Area of a equilateral triangle is 400√3 sq.m. then perimeter is-

The diagonal of a square is cm. The diagonal of another square whose area is double that of the first square is :

The curved surface area of a cylinder is five times the area of its base. Find the ratio of radius and height of the cylinder.

A solid metallic sphere of radius 12 cm is melted and recast into a cone having diameter of the base as 12 cm. What is the height of the cone?

If the areas of two isosceles triangles are in the ratio of X² : Y², then the ratio of their corresponding heights is:

In a triangle, two sides of 4 cm and 3 cm are at right angle. If the triangle is revolved along the 4 cm side, the curved surface area of the cone so formed will be

The curved surface area of a right cylinder is 3696 cm². Its height is three times its radius. What is the capacity (in litres) of the cylinder? (Take π =22/7)