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# CBSE Class 9 Maths Chapter 9 Areas of Parallelograms and Triangles Revision Notes

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## CBSE Class 9 Maths Chapter Chapter 9 Areas of Parallelograms and Triangles Revision Notes

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## Parallelogram

Parallelogram is a special type of quadrilateral whose opposite sides do not
intersect. Parallelogram comes in the form of rectangles, rhombuses, and squares.

Area of parallelogram:

If two parallelograms lie on the same base or equal base and have equal areas then they must lie between the same parallels.

Formula: Product of its base and corresponding altitude (Area = bh = BH)

## Triangle

A Triangle is a polygon with three edges and three vertices.

Area of triangle:

Triangles ABD and ACD are on the same base and between same parallels. This implies that ar (ABD) = ar (ACD).

If two triangles lie on the same base or equal base and have equal areas then they must have equal altitudes

Formula: Area of a triangle is half the product of its base and corresponding altitude (or altitude is what we call as height). Area = 1/2 b X h