NCERT Solutions class 7 Maths Chapter-11 Exercise 11.1

NCERT Solutions class 7 Maths Chapter-11 Perimeter and Area

Perimeter and Area Exercise-11.1

NCERT Solutions Class-7 Maths chapter-11 Perimeter and Area Exercise-11.1 is prepared by academic team of pw all the questions of NCERT text book are solved step by step with proper and detail solutions explaining each and every questions . For More and additional questions of CBSE class 7 maths you can go to class 7 maths sections. NCERT class 7 Maths Solutions is the best way to enhanced your mathematics skill. And pw practice worksheet & question bank will help you a lot .

Solutions of Chapter Perimeter and Area Exercise-11.1

Question 1:
The length and the breadth of a rectangular piece of land is 500 m by 300 m respectively.
Find:
(i) Its area
(ii) The cost of the land, if 1 m² of the land costs Rs. 10,000.

Answer:
It is given in the question that,
Length of rectangular piece of land = 500 m
Breadth of rectangular piece of land = 300 m
(i) We know that,
Area of rectangle = Length × Breadth
= 500 × 300
= 150000 m2
∴ Area of rectangular piece of land = 150000 m²
(ii) It is given in the question that,
Cost of 1 m² land = Rs 10,000
Hence,
Cost of 150000 m² land = 10000 × 150000
= Rs 1500000000

Question 2:
Find the area of a square park whose perimeter is 320 m.

Answer:
It is given in the question that,
Perimeter of square park = 320 m
We know that,
Perimeter of square park = 4 × Length of the side of park
320 = 4 × Length of the side of the park
∴ Length of side of park = 320/4
= 80 m
We also know that,
Area of square = (Side)²
= (80)²
= 6400 m²

Question 3:
Find the breadth of a rectangular plot of land. If its area is 440 m² and the length is 22 m.
Also find its perimeter.

Answer:
It is given in the question that,
Length of the rectangular plot of land = 22 m
Area of rectangular plot of land = 440 m²
We know that,
Area of rectangle = Length × Breadth
440 = 22 × Breadth
∴ Breadth = Area/Length
=440/22
= 20 m
Breadth of the rectangular plot of land = 20 m
We know that:
Perimeter of rectangle = 2 (length + Breadth)
= 2 (22 + 20)
= 2 (42)
= 84 m
Hence, perimeter of rectangle = 84 m

Question 4:
The perimeter of a rectangular sheet is 100 cm. If the length is 35 cm, find its breadth. Also find the area.