Double square trick|

Area of a square is doubled if the side of the square is doubled.

The diagonal of a square is 14 cm. What will be the length of the diagonal of the square whose area is double of the area of first square?

The diagonal of a square is 4 sqrt(2) cm. The diagonal of another square whose area is double that of the first square is

The diagonal of a square is 10 cm. What will be the length of the diagonal of the square whose area is double of the area of first square?