RD Sharma Solutions for Class 8 Maths Chapter 20 Mensuration I (Area of a Trapezium and a Polygon)

We will discuss problems on finding the area of polygons by using the formulae for the area of a triangle and that of a trapezium. A trapezium is a 2d shape, and a type of quadrilateral, which has only two parallel sides and the other two sides are non-parallel. In Euclidean Geometry, a quadrilateral is defined as a polygon with four sides and four vertices.

Quadrilaterals are either simple or complex. The simple quadrilaterals are not self-intersecting, and it is categorised as a convex or concave quadrilateral. The interior angles of the quadrilateral are equal to 360 degrees. Just like other four-sided polygons, a trapezium also has area and perimeter.