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`20sqrt(7)" sq-cm "``10sqrt(14)" sq-cm "``20sqrt(14)" sq-cm "`140 sq-cm

**Introduction**

**Square millimetre**

**Square centimetre**

**Square decimetre**

**Square metre**

**ARE: The area of a region formed by a square of side one decameter (1 dam) is called an are written as `1dam^2` or 1 are.**

**HECTARES: The area of a region formed by a square of side 1 hectometer (1 hm) is called a hectare written as `1 hm^2`.
Square Kilometer: The area of a region formed by a square of side 1 km is called a square kilometer written as 1 km^2 .
**

**Perimeter and area of a rectangle**

**Perimeter and area of a square**

**Area of four walls of a room**