Page 121 - Revised Maths Wisdom Class - 6
P. 121
Perimeter and Area 119
COGNITIVE
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.
It is only one-dimensional. It express in meter /cm etc.
2
2
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 Irregular Shapes
where n is no. of sides
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.
