One side of the rectangular ground is 8m and its diagonal is 17m. Find the area of the ground?

The area of the base of a right circular cone is 400π and its height is 15 cm. The curved surface of the cone ( in cm²) is:

The area  of a circle is 616 sq cm, find its circumference?

A polygon has 14 sides then find out No. of diagonals in that polygon. 

A cylindrical well of depth 21 m with internal radius of 13 m is dug up. The mud, so detained, is spread evenly to form a platform of dimension 52 × 13.2. What is the height of the platform?

The area of a triangle is 24 square cm. If one side of it is 4 cm, what will be the height of the triangle?

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

In the given figure if each of the outer circles have radii ‘R’, then the radius of the inner circle will be: