The length of the diagonal of a square is 'a' cm. Which of the following represents the area of the square (in sq. cm)? 

A solid cube, whose diagonal is $$ 128 {\ sqrt {2}} \ cm $$, is molded to form a cuboid. The length and width of the cuboid are 512 cm and 160 cm, respectively. What is the height of the cuboid?

The ratio of the areas of two circles is 16: 25. What will be the ratio of their circumferences?

Find the area of a white sheet required to prepare a cone with a height of 21cm and the radius of 20cm.

A wall is the form of a trapezium with height 8 m and parallel sides being 5 m and 10 m. What is the cost of painting the wall, if the rate of painting is Rs. 50 per square meter  ?

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 area of square field is $$ ({69696})^{2}$$. Its diagonal will be equal to (use √2 = 1.414) 

The volume of a cube is $$ 512{cm}^{3}$$. Its surface area (in sq cm) is