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

If the areas of circular ring having inner and outer radius 8 cm and 12 cm respectively is equal to the total surface area of cylinder of radius R₁ and height h, then h in terms of R₁ will be :

The lengths of the parallel sides of a trapezium are 51 cm and 21 cm, and that of each of the other two sides is 39 cm. what is the area ( in cm²) of the trapezium?

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

A polygon has 9 sides, what is its interior angle?

The ratio of the volume of right circular cylinder and a right circular cone of the same base and height will be:

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?

A circular park whose diameter is 210 m has a 5 m wide path running around it(on the outside). What is the area ( in m²) of the path?