The circumference of a circle is 792 m. What will be its radius?

A took 15 sec. to cross a rectangular field diagonally walking at the rate of speed 52m / min and B took the same time to cross the same field along its sides walking at the rated speed 68 m / min. The area of the field is: 

A man crosses a diagonal of square in two minutes at the speed of 6 km./hr. Find the area of the square-

The ratio of the area of a square to that of the square drawn on its diagonal is :

The area of two equilateral triangles are in the ratio 25 : 36 . Their altitudes will be in the ratio: 

A square has a perimeter equal to 24 units. If the length of each side of the square is reduced by 2 units, then find the area( in sq units) of the square.

The base of a right prism is an equilateral triangle. If its height is one-fourth and each side of the base is tripled, then the ratio of the volumes of the old to the new prism is /

If D and E are the mid-points of the side AB and AC respectively of the ∆ABC in the figure given here, the shaded region of the triangle is what percent of the whole triangular region?