I think its eaasy...bt cudnt get the ans.

arrey somebody help yarrrrrrr

It's better with trigonometry.
Inradius of the triangle is known.....now the side of the square be x, so 2x²=4r² so x²=2r².....where r is the inradius of the triangle.

now ... r=​2√​3​​​​​a​​

and for any square inscribedin the circle ... we have the diagonal is twice the radius of the circle..

let the side of square be b

then

so area of square =b​2​​=​6​​a​2​​​​

That finishes off the job.

thank u everyone......