⇒ We know the properties of rectangle that, its opposite sides are equal and parallel.⇒ All four angles of rectangle is 90∘
⇒ So, by using these properties we are going to construct rectangle.
⇒ We have given one of it's side 4cm and diagonal 5cm.
⇒ Draw a line segment AB = 4cm.
⇒ Construct an angle of 90∘ at point A and B.
⇒ Cut off AC = 5cm.
⇒ Take A as a center and radius same as side BC and cut of AD.
⇒ Join AC, BD and CD.
⇒ We have to measure an acute angle between diagonals.
∴ ∠AOD=∠BOC=74∘