A parallelogram is a quadrilateral with two pairs of parallel sides. The opposite sides of a parallelogram are equal in length & opposite angles are equal in measures. The Area of a parallelogram is given by the formulae:
Area = base × height
A triangle is a plane figure with three straight sides and three angles. The sum of angles of a triangle is equal to 180 degrees and the exterior angles of a triangle are always equal to 360 degrees. In a triangle, the sum of the angles is always greater than the length of the third angle. The area of a triangle is given by the formulae:
½ * base * height.
Notes related to Chapter 9 of Class 9 Maths can be downloaded from the link below:
For more information about the Areas of Parallelograms and Triangles, click on the below-mentioned links.