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Trapezium
**

**
**

**
**

One pair of parallel sides

AB ∥ CD

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Parallelogram
**

**
**

**
**

Opposite sides are parallel

- AB ∥ CD
- AD ∥ BC

Opposite sides are equal

- AB = CD
- AD = BC

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**
Rhombus
**

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Parallelogram with all sides equal

So,

- AB ∥ CD & AD ∥ BC
- AB = BC = CD = AD

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**
Rectangle
**

**
**

Parallelogram with opposite sides equal & all 4 angles 90°

So,

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

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Square
**

**
**

Parallelogram with all sides equal & all 4 angles 90°

So,

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