Properties of a parallelogram ll Cbse NCERT class 9 maths Chapter quadrilaterals

Properties of parallelograms

One special kind of polygons is called a parallelogram. It is a quadrilateral where both pairs of opposite sides are parallel.

There are six important properties of parallelograms to know:

1. Opposite sides are congruent (AB = DC).
2. Opposite angels are congruent (D = B).
3. Consecutive angles are supplementary (A + D = 180°).
4. If one angle is right, then all angles are right.
5. The diagonals of a parallelogram bisect each other.
6. Each diagonal of a parallelogram separates it into two congruent 

Introduction to arithmetic progression ll basic ll sums ll NCERT cbse class 10 chapter 5

Introduction to arithmetic progression ll basic ll sums ll NCERT cbse class 10 chapter 5
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Sum of Arithmetic progression ll sums ll NCERT CBSE class 10 chapter 5 AP Arithmetic progression

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