If a chord of length 30 cm is at a distance of 8 cm from the center of the circle, then the length of the chord of the same circle which is at a distance of 15 cm from the center is equal to

How much parts of the pits, which are 48 meters long, 16.5 meters wide and 4 meters deep, can be filled in the soil, which is obtained by cylindrical tunnel of 4 meters diameter and 56 meters long?

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

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:

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?