Dear Student,
The dimensions of the piece of cloth are 2.5 m× 75cm =( 2.5×100)cm × 75cm
= 250cm × 75cm.
A square handkerchief has to be cut out from the piece of cloth.
In a square, length = breadth.
Hence, if the Side of the square = 75 cm, it will be the largest square that can be cut from the piece of cloth.
Therefore, maximum length of size of square = 75cm Ans.
Regards