Parallelogram, in Geometry, is a non-self-intersecting quadrilateral with two pairs of parallel sides. A trapezoid is a quadrilateral with only one pair of parallel sides. In a parallelogram, the diagonals bisect each other. Whereas, a triangle is a polygon with three vertices and three edges. A triangle can be classified into the isosceles triangle, equilateral triangle, and scalene triangle. The diagonal of a parallelogram are of equal lengths, and each diagonal of a parallelogram separates it into two congruent triangles. The Chapter is based on essential topics like figures on the same base and between the exact parallels, polygonal regions and area axioms.