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
Click here for the solutions of
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
