Question

construct a square having area of "12.25" CM square using a pair of compass and ruler​

Answer 1

A simple way could be as follows

As area is 12.25, hence side length would be root(12.25), get this value, let's call it x. Now draw a circle with radius X/2. Take it's center to be the origin.

Finally draw tangents to the square at 4 points in different quadrant to get a square