In a rectangle length is greater than its breadth by 4 cm. Its perimeter is 20 cm. Then what is its area ?
A21
B20
C10
D30
A21
B20
C10
D30
Related Questions:
A hollow iron pipe is 21 cm long and its exterior diameter is 8 cm. If the thickness of the pipe is 1 cm and iron weighs 8 g/cm3, then the weight of the pipe is