Page 113 - Maths Skill - 6

Perimeter and Area 111

MIND MAP

Mensuration (Perimeter and Area)

Perimeter Area
� It is like a fence around a shape. � It is two-dimensional.
� It denotes the total length of the � It represents the covered space
shape's boundary. of the 2-D boundary.
2
2
� It is only one-dimensional. � It express in meter /cm etc.
� It express in meter/cm etc.

Formulae Formulae

� Triangle side (1) + side (2) + side (3)
� Rectangle 2 (length + breadth)
� Square 4 × side

� Any Regular Polygon n × side
where n is no. of sides Irregular Shapes
h
� A = (f + m + ) sq. unit
2
where
Regular Shapes � f number of complete square
� Rectangle Length × breadth � m number of more than half

� Square (side) 2 enclosed square
1
� Triangle × base × height � h number of exactly half
2 enclosed square
� Equilateral Triangle 3 ×(side) 2
4

Real Life Example
Perimeter is about the outside length of a particular 2-dimensional region while area is about
the inside space of that 2-dimensional region.