A quadrilateral is a shape with four sides and four corners. Sometimes, they are called quadrangles or tetragons. The word quadrilateral is made of the words quad (meaning "four") and lateral (meaning "of sides"). The formula for finding the area of the quadrilateral is :-
= 1/2 d (h1 + h2) Where h1 and h2 are the heights and d is the diagonal of the quardilateral.