Revision Notes For CBSE Class 9 Math Chapter -9 Areas of Parallelograms and Triangles

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.

Check here for the free CBSE Class 9 Math revision notes for Chapter 9- Areas of Parallelograms and Triangles

Class 9 Math Chapter 9 - Areas of Parallelograms and Triangles
Class 9 Math Chapter 9 - Areas of Parallelograms and Triangles
Class 9 Math Chapter 9 - Areas of Parallelograms and Triangles
Class 9 Math Chapter 9 - Areas of Parallelograms and Triangles
Class 9 Math Chapter 9 - Areas of Parallelograms and Triangles

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Practise This Question

Raman had to draw an isosceles triangle with base angles as 65 each and base length of 5cm. Raman said the given data is insufficient. Is he correct?