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:

A circular grass field of diameter 42 m is surrounded by a path of width 3.5 m. What will be the cost of graveling the path at the rate ₹ 4 square meter?

The sum of the radii of spheres A and B is 14 cm, the radius of A being larger than that of B. The difference between their surface areas is 112 π . What is the ratio of the volumes of A and B?