Of al the ||gms of given sides: the ||gm which is rectangle has the greatest area

Prove that of all parallelograms of which the sides are given,the parallelogram which is rectangle has the greatest area.

Show that of all the rectangles of given area, the square has the smallest perimeter.

Show that all the rectangles with a given perimeter,the square has the largest area.

Show that all the rectangles with a given perimeter,the square has the largest area.

In the given figure, a ||gm ABCD and a rectangle ABEF are of equal area. Then,

The area of a square is 900cm^(2) . The length of a rectangle is equal to the side of the given square and breadth of the rectangle is equal to half the length of the rectangle. The area of rectangle is

Perimeter of a square and a rectangle is same. If a side of the square is 15cm one side of the rectangle is 18cm, find the area of the rectangle.

Each diagonal of a |gm divides it into two triangles of the same area

The greatest side of the rectangle of the greatest area that can be inscribed in the ellipse x^(2)+2y^(2)=8 ,is