The shaded portion of the figure, given alongside, shows two concentric circles.

If the circumference of the two circles be 396 cm and 374 cm, find the area of the shaded portion.

The base of a right triangle is 8 cm and its hypotenuse is 10 cm; the area of triangle is:

1. 24 cm²

2. 40 cm²

3. 48 cm²

4. 80 cm²

If the perimeter of a square is 80 cm, its area is 80 cm².

1. true

2. false

3. none of these two

If the area of a trapezium is 32 cm² and distance between its parallel sides is 8 cm; the sum of length of its parallel side is :

1. 4 cm

2. 16 cm

3. 8 cm

4. 12 cm