question_answer

A wire of length \[20\text{ }cm\]is bent in the form of a sector of a circle. The maximum area that can be enclosed by the wire is

A) \[20\text{ }sq\text{ }cm\]       

B) \[25\text{ }sq\text{ }cm\]

C) \[10\,\,sq\,\,cm\]       

D) \[30\,\,sq\,\,cm\]

Correct Answer: B

Solution :

Given that