The DAV Maths Book Class 4 Solutions and DAV Class 4 Maths Chapter 12 Worksheet 3 Solutions of Area offer comprehensive answers to textbook questions.
DAV Class 4 Maths Ch 12 WS 3 Solutions
Question 1.
Fill in the blanks.
(a) The best unit of measuring area is ________.
Answer:
Square
(b) Measure of the amount of surface enclosed by a closed figure is called ________.
Answer:
Area
(c) Area of rectangle = Length × ________.
Answer:
Breadth
(d) Area of square = ________ × ________.
Answer:
Side × Side
(e) The area of a square having one side equal to 1 cm is ________.
Answer:
1 sq. cm
Question 2.
Find the area of a rectangle whose dimensions are given below:
(a) Length = 8cm Breadth = 3 cm
Answer:
Length = 8 cm Breadth = 3 cm
Area of rectangle = Length × Breadth
= 8 cm × 3 cm
= 24 cm2 or 24 sq. cm
(b) Length = 12cm Breadth = 9 cm
Answer:
Length = 12 cm, Breadth = 9 cm
Area of rectangle = Length × Breadth
= 12 cm × 9 cm
= 108 cm2 or 108 sq. cm
(c) Length = 32m Breadth = 12 m
Answer:
Length = 32 m, Breadth = 12 m
Area of rectangle = Length × Breadth
= 32 m × 12 m
= 384 m2 or 384 sq. m
(d) Length = 1m Breadth = 75 cm
Answer:
Length = 1 m, Breadth = 75 cm
Area of rectangle = Length × Breadth
= (1 m × 100) × 75 cm
= 7500 cm2 or 7500 sq. cm
Question 3.
Find the area of the following squares whose sides are given below:
(a) 6 cm
Answer:
Side of square = 6 cm
Area of square = side × side
= 6 cm × 6 cm
= 36 cm2 or 36 sq. cm
(b) 11 cm
Answer:
Side of square = 11 cm
Area of square = side × side
= 11 cm × 11 cm
= 121 cm2 or 121 sq. cm
Question 4.
The length of a carpet is 5 metres and the breadth is 2 metres. Find the area of the carpet.
Answer:
Length of carpet = 5 metres
Breadth of carpet = 2 metres
Area of carpet = Length × Breadth
= 5 metre × 2 metre
= 10 m2 or 10 sq. m
Question 5.
The length of the one side of a square handkerchief is 22 cm. Find the area of the handkerchief.
Answer:
Length of one side of square handkerchief = 22 cm
Area of square = side × side
= 22 cm × 22 cm
= 484 cm2 or 484 sq. cm
Question 6.
The length of a playground is 10 metres and breadth is 6 metres. Find the area of the playground.
Answer:
Length of playground = 10 metres
Breadth of playground = 6 metres
Area of playground = 10 m × 6 m
= 60 m2 or 60 sq. m
DAV Class 4 Maths Chapter 12 Value Based Questions
Question 1.
How much field was irrigated by Raghu?
Answer:
Raghu irrigated \(\frac{1}{4}\) field area.
So, first we have to find area of the field. Then we have to divide it by 4.
Area of field = Length × Breadth
= 90 m × 40 m
= 3600 sq. m
Raghu irrigated \(\frac{1}{4}\) field area so
= Total area ÷ 4
= \(\frac{3600}{4}\)
= 900 sq. m
Question 2.
Which value is reflected by Raghu?
Answer:
Raghu showed value of kindness and of helping nature to the needy.
Question 3.
How can you help old people in their work?
Answer:
We can help old people in their work by:
(a) Bringing any needed item by them from nearby shops.
(b) Helping them in carrying their loads.
(c) Giving front position to the old people standing in a queue at public places like Bank, Post office etc.
DAV Class 4 Maths Chapter 12 Worksheet 3 Notes
Units of Area:
The units used to measure area are:
- Square centimetre (sq. cm)
- Square metre (sq. m)
- Square millimetre (sq. mm)
Area of Rectangle And Square
- Area of rectangle = Length × Breadth
- Area of square = side × side
E.g. The length of a park is 20 metre and breadth is 7 metres find the area of the park.
Answer:
Length of park = 20 m.
Breadth of park = 7 m
Area = 20 × 7 m
= 140m2 or sq. m