Page 178 - Math Skill - 5

176 Maths

MIND MAP

Perimeter and Area of Rectilinear Figures

“A plane figure constructed by the line segments is called rectilinear figure”
e.g. triangle, rectangle, square etc.

Circle is not a
Rectilinear Figure

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 or cm etc.
� It express in meter or cm etc.

Formulae Formulae
1
� Triangle: Side (1) + Side (2) + Side (3) � Triangle: × base × height
2
√3
� Rectangle: 2 (length + breadth) � Equilateral Triangle: × (side) 2
� Square: 4 × side 4
� Equilateral Triangle: 3 × side � Rectangle: length × breadth
� Square: (side) 2

Real Life Example
Suppose you are standing in a park then the length of its boundary represents the
perimeter while the inside space of the park represents the area of this park.