The area of square is 49x2 what is the length of diagonal of the square?

The area of square is 49x² what is the length of diagonal of the square?

A 7x

B 14x

C 7x√2

D 7x√3

Correct Answer: Option C

Given, area=49x²

∴ length of side=√49x² = 7x

∴ length of diagonal =7x√2