  ## Trapezium One pair of parallel sides

AB ∥ CD

## Parallelogram Opposite sides are parallel

• AB ∥ CD

Opposite sides are equal

• AB = CD

## Rhombus Parallelogram with all sides equal

So,

• AB ∥ CD & AD ∥ BC
• AB = BC = CD = AD

## Rectangle Parallelogram with opposite sides equal & all 4 angles 90°

So,

• AB ∥ CD & AD ∥ BC
• AB = CD & AD = BC
• ∠A = ∠B = ∠C = ∠D = 90°

## Square Parallelogram with all sides equal & all 4 angles 90°

So,

• AB ∥ CD & AD ∥ BC
• AB = BC = CD = AD
• ∠A = ∠B = ∠C = ∠D = 90°

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1. Chapter 8 Class 9 Quadrilaterals
2. Concept wise

Transcript

One pair of parallel sides AB ∥ CD Two pairs of parallel lines AB ∥ CD AD ∥ BC Opposite two sides are equal AB = CD AD = BC Parallelogram with all sides equal & all 4 angles 90° So, AB ∥ CD & AD ∥ BC AB = BC = CD = AD ∠A = ∠B = ∠C = ∠D = 90° Parallelogram with all sides equal & all 4 angles 90° So, AB ∥ CD & AD ∥ BC AB = CD = AD = BC ∠A = ∠B = ∠C = ∠D = 90° Parallelogram with all sides equal & all 4 angles 90° So, AB ∥ CD & AD ∥ BC AB = BC = CD = AD ∠A = ∠B = ∠C = ∠D = 90° 