The area of a trapezium is 279 sq. cm and the distance between its two parallel sides is 18 cm. If one of its parallel sides is longer than the other side by 5 cm, find the lengths of its parallel sides.

The area of a rhombus is equal to the area of a triangle. If base of triangle is 24 cm, its corresponding altitude is 16 cm and one of the diagonals of the rhombus is 19.2 cm, find its other diagonal.

The circumference of a circle is numerically same as its area; then its radius is :

1. 4 unit

2. 2 unit

3. 1 unit

4. none of these

The perimeter of a square of side 11 cm is equal to circumference of a circle; then the diameter of the circle is :

1. 7 cm

2. 7.5 cm

3. 14 cm

4. 3.5 cm