Page 158 - Math Skill - 4

156 Maths

MIND MAP

Perimeter and Area

“A plane figure bounded by the line segments is called rectilinear figure.
e.g. triangle, quadrilateral etc.

Circle is not a
Rectilinear Figure

Perimeter Area

� It is like a fence around a shape. � It represents the covered space of
� It denotes the total length of the shape’s the 2-D boundary
2
boundary. � It express in meter or cm 2
� It express in meter or cm.

Formulae Formulae
� Triangle � Triangle
P A

Perimeter = PQ + QR + PR Height 1
Q R B Base C Area = × Base × Height
2
� Rectangle: It has its opposite sides equal � Rectangle

A B
b Perimeter = 2 (l + b) b Area = l × b
l D l C

� Square: It has all four sides equal � Square
A B
Perimeter = 4 × side
Area = side × side

D C