Draw a square of side 5cm.
Extend AB to 7 cm (AE = 7cm) Draw an arc taking A as centre and AE a radius. Extend DA and mark the point F.
Elongate BA towards left, and mark G such that AD = AG. Draw Δ GFB.
Circumcircle of A GFB will meet side AD on H.
AG × AB = AF × AH.
That is area of the rectangle having length AB and width AD is equal to the area of rectangle having length AE a width AH.
