# Mensuration

## Exercise 10.2

1). Find the areas of the following figures by counting square:

a) number of full boxes = 9

area of the shape = number of boxes

= 9 sq units

b) number of full boxes = 5

area of the shape = number of boxes

= 5 sq units

c) number of full boxes = 2

number of half boxes = 4

area of the shape = number of full boxes + ½ X number of half boxes

= (2 + ½ X 4)

= 2 + 2

= 4 sq units

d) number of full boxes = 2

area of the shape = number of full boxes

= 8 sq units

e) number of full boxes = 10

area of the shape = number of full boxes

= 10 sq units

f) number of full boxes = 2

number of half boxes = 4

area of the shape = number of full boxes + ½ X number of half boxes

= (2 + ½ X 4)

= 2 + 2

= 4 sq units

g) number of full boxes = 4

number of half boxes = 4

area of the shape = number of full boxes + ½ X number of half boxes

= (4 + ½ X 4)

= 4 + 2

= 6 sq units

h) number of full boxes = 5

area of the shape = number of full boxes

= 5 sq units

i) number of full boxes = 9

area of the shape = number of full boxes

= 9 sq units

j) number of full boxes = 2

number of half boxes = 4

area of the shape = number of full boxes + ½ X number of half boxes

= (2 + ½ X 4)

= 2 + 2

= 4 sq units

k) number of full boxes = 4

number of half boxes = 2

area of the shape = number of full boxes + ½ X number of half boxes

= (4 + ½ X 2)

= 4 + 1

= 5 sq units

l) number of full boxes = 2

number of more than half boxes = 5

number of half boxes = 2

number of less than half boxes = 1

area of the shape = number of full boxes + more than half boxes

+ ½ X number of half boxes

= (2 + 5 + ½ X 2)

= 2 + 5 + 1

= 8 sq units

m) number of full boxes = 7

number of more than half boxes = 5

number of half boxes = 4

number of less than half boxes = 4

area of the shape = number of full boxes + more than half boxes

+ ½ X number of half boxes

= (7 + 5 + ½ X 4)

= 7 + 5 + 2

= 14 sq units

n) number of full boxes = 10

number of more than half boxes = 8

number of half boxes = 0

number of less than half boxes = 5

area of the shape = number of full boxes + more than half boxes

+ ½ X number of half boxes

= (10 + 8 + ½ X 0)

=10 + 8 + 0

= 18 sq units

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Chapter 10 Mensuration

Chapter 8 Decimals

Chapter 7 Fractions

Chapter 6 Integers

Chapter 5 Understanding Elementary Shapes

Chapter 4 Basic Geometrical Ideas

Chapter 3: Playing With Numbers

Chapter 2: Whole Numbers

Chapter 1: Knowing Our Numbers