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Area can be defined as the surface measured inside the boundary of a 2 - dimensional plane objects like triangle, circle, rectangle, square, … In the following diagrams, red surface denotes the area.

Area is measured in terms of unit squares (unit centimeter squares or unit meter squares)

Standard unit of area of plane figures is a square centimeter (cm^{2}) or square meter(m^{2})

Square centimeter (cm^{2}) is the area of planar region bounded by a square of side one centimeter.

Square meter (m^{2}) is the area of planar region bounded by a square of side one meter.

Perimeter is the total length required to make the boundary of a 2 - dimensional plane objects such as triangle, circle, rectangle, square,… The black line denotes the perimeter.

**Area of a triangle = $\frac{1}{2}$ x b x h square units where b is the base and h is the height**

**Area of rectangle = l x w square units where l is the length and w is the width**

**Area of trapezoid = $\frac{1}{2}$ (a +b) h square units where a and b are the length of the sides of the trapezoid and h is the vertical height**

**Area of square = a ^{2} square units where a is the length of the side of the square**

**Area of parallelogram= b x h square units where b and h are base and height of the parallelogram**

**Area of circle = $\pi$ x r ^{2} square units where r is the radius of the circle**