question_answer

The length and breadth of a rectangular hall are 0.4 m and 30 cm respectively. The distance between two opposite comers of the hall is

A) 34.16 m         

B) 50 m

C) 34.16 cm       

D) 50 cm

Correct Answer: D

Solution :

    Length of the rectangular hall \[=0.4\,m=40\,cm.\] Breadth of the rectangular hall \[=30\,cm.\] Distance between two opposite corners \[=\sqrt{{{l}^{2}}+{{b}^{2}}}=\sqrt{{{40}^{2}}+{{30}^{2}}}=\sqrt{1600+900}\] \[=\sqrt{2500}=50\,cm.\]