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Mind Map Creative Thinking
math
Perimeter And AreA

Perimeter and Area Area of Composite Figures

rectangle:
l I

b II

Perimeter of a rectangle = 2 (length + breadth) units III
Area of a rectangle = (length × breadth) sq. units
Area of complete figure = Area of rectangle (I)
Square:
s + Area of rectangle (II)
+ Area of rectangle (III)
s
Area of irregular Shapes

Perimeter of a square = 4 × side units 1
Area of a square = (side × side) sq. units Area of an irregular closed figure = (m + n + p) sq. units,
2
where
triangle: m = full squares
n = more than half squares
p = half squares

Perimeter of a triangle = sum of its three sides units
Perimeter of an equilateral triangle = (3 × side) units
1
Area of a triangle = × Area of a square or rectangle sq.
2 units

www
MAths connect Cross-Curricular Learning

In construction and engineering, both
commercial and residential buildings are 209 m 75 m
constructed using the idea of a perimeter
and area. It makes it easier to distinguish 28 m 1 m Front
between the geometrical features of 1 m Door 6 m 100 m
buildings before and after construction. 310 m
2 m
Observe the building map and answer the following questions.

1. What is the perimeter of the building?
2. What is the area of the roof of the building?
3. What is the area of the front door?
4. What is the area of a window?
5. What is the area enclosed by the compound?

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