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Perimeter And Area Class-7 ML Aggarwal ICSE Maths Solutions

Perimeter And Area Class-7 ML Aggarwal ICSE Mathematics Solutions Chapter-16. We provide step by step Solutions of Exercise / lesson-16 Perimeter And Area  ICSE Class-7th  ML  Aggarwal Maths.

Our Solutions contain all type Questions with Exe-16.1 , Exe-16.2,  Exe-16.3, Objective Type Questions ( including Mental Maths Multiple Choice Questions, HOTS ) and Check Your Progress to develop skill and confidence. Visit official Website CISCE for detail information about ICSE Board Class-7 Mathematics.

Perimeter And Area Class-7 ML Aggarwal ICSE Mathematics Solutions Chapter-16


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Exe 16.1 ,

Exe-16.2,

Exe-16.3,

Objective Type Questions, 

Mental Maths,

Multiple Choice Questions ,(MCQ)

HOTS

Check Your Progress

 


Ex 16.1, Perimeter And Area Class-7 ML Aggarwal ICSE Mathematics Solutions 

Question 1.
ABCD is a square of side 24 cm. EF is parallel to BC and AE = 15 cm. By how much does
(i) the perimeter of AEFD exceed the perimeter of EBCF?
(ii) the area of AEFD exceed the area of EBCF?
ML Aggarwal Class 7 Solutions for ICSE Maths Chapter 16 Perimeter and Area Ex 16.1 Q1

Answer

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Side of the square ABCD = 24 cm
EF || BC || AB is drawn and AE = 15 cm
EB = 24 – 15 = 9 cm
ML Aggarwal Class 7 Solutions for ICSE Maths Chapter 16 Perimeter and Area Ex 16.1 Q1.1
(i) Now perimeter of AEFD = 2(15 + 24) cm = 2 × 39 = 78 cm
and perimeter of EBCF = 2(9 + 24) = 2 × 33 cm = 66 cm
Difference of perimeter = 78 – 66 = 12 cm
(ii) Now Area of AEFD = l × b = 15 × 24 = 360 sq. cm
and area of EBCF = 9 × 24 = 216 sq. cm
Difference = 360 – 216 = 144 sq. cm

Question 2.
Nagma runs around a rectangular park 180 m long and 120 m wide at the rate of 7.5 km/ hour. In how much time will she complete five rounds?

Answer


Length of rectangular plot (l) = 180 m
and breadth (b) = 120 m
Perimeter = 2(l + b) = 2(180 + 120) m = 2 × 300 = 600 m
Distance travelled in 5 rounds = 600 × 5 = 3000 m = 3 km
Speed = 7.5 km/hr
ML Aggarwal Class 7 Solutions for ICSE Maths Chapter 16 Perimeter and Area Ex 16.1 Q2

Question 3.
The area of a rectangular plot is 540 m2. if its length is 27 m, find its breadth and perimeter.

Answer

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Area of a rectangular plot = 540 m2
Length (l) = 27 m
ML Aggarwal Class 7 Solutions for ICSE Maths Chapter 16 Perimeter and Area Ex 16.1 Q3
and perimeter = 2(l + b) = 2(27 + 20) m = 2 × 47 = 94 m

Question 4.
The perimeter of a rectangular field is 151 m. If its breadth is 32 m, find its length and area.

Answer


Perimeter of a rectangular field = 151 m
Breadth = 32 m
Length =\frac { Perimeter }{ 2 } – Breadth
\frac { 151 }{ 2 } – 32
\frac { 87 }{ 2 }
= 43.5 m
and area = l × b = 43.5 × 32 m2 = 1392 m2

Question 5.
The area of a rectangular plot is 340 m2 and its breadth is 17 m. Find the cost of surrounding the plot with a fence at ₹ 5.70 per meter.

Answer


Area of plot = 340 m2
and breadth (b) = 17 m
Length = \frac { A }{ b } = \frac { 340 }{ 17 } = 20 m
Perimeter = 2(l + b) = 2(20 + 17) = 2 × 37 = 74 m
Rate of fencing around it = ₹ 5.70 per m
Total cost = ₹5.70 × 74 = ₹ 421.80

Question 6.
The area of a square park is the same as that of a rectangular park. If the side of the square park is 60 m and the length of the rectangular park is 90 m, find the breadth of the rectangular park.

Answer

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Side of a square park = 60 m
Area = (Side)2 = 60 × 60 = 3600 m2
Area of rectangular park = 3600 m2
and length (l) = 90 m
ML Aggarwal Class 7 Solutions for ICSE Maths Chapter 16 Perimeter and Area Ex 16.1 Q6

Question 7.
A wire is in the shape of a rectangle. Its length is 40 cm and breadth is 22 cm. If the same wire is rebent in the shape of a square, what will be the measure of each side? Also, find which shape encloses more area and by how much?

Answer


A wire in shape of a rectangle whose length (l) = 40 m
and breadth (b) = 22 m
Perimeter (Length) of wire = 2(l + b) = 2(40 + 22) cm = 2 × 62 cm = 124 cm
Perimeter of square wire = 124 cm
Then side = \frac { Perimeter }{ 4 } = \frac { 124 }{ 4 } = 31 m
Now area of rectangle = l × b = 40 × 22 = 880 cm2
and area of square = (Side)2 = (31)2 cm2 = 961 cm2
Difference in area = 961 – 880 = 81 cm2
Area of 81 cm2 is more of square shaped wire.

Question 8.
A door of breadth 1 m and height 2 m is fitted in a wall. The length of the wall is 4.5 m and the height is 3.6 m. Find the cost of whitewashing the wall, if the rate of whitewashing the wall is ₹ 20 per m2.

Answer


Breadth of door = 1 m and height = 2 m
Area of door = l × b = 1 × 2 = 2 m2
Length of wall = 4.5 m and height = 3.6 m
Area = 4.5 × 3.6 m2 = 16.2 m2
Area of wall excluding area of door = 16.2 – 2 = 14.2 m2
Rate of white washing = ₹ 20 per m2
Total cost = 14.2 × 20 = ₹ 284

Question 9.
A rectangular park is 45 m long and 30 m wide. A path 2.5 m wide is constructed outside the park. Find the area of the path.

Answer


Length of a rectangular park (l) = 45 m
and breadth (b) = 30 m
Width of path outside the park = 2.5 m
Outer length (L) = 45 + 2 × 2.5 m = 45 + 5 = 50 m
ML Aggarwal Class 7 Solutions for ICSE Maths Chapter 16 Perimeter and Area Ex 16.1 Q9
and width (B) = 30 + 2 × 2.5 = 30 + 5 = 35 m
Area of park = L × B – l × b
= 50 × 35 – 45 × 30 m2
= 1750 – 1350
= 400 m2

Question 10.
A carpet of size 5 m × 2 m has 25 cm wide red border. The inner part of the carpet is blue in colour. Find the area of the blue portion. What is the ratio of the areas of red portion to blue portion?

Answer


Length of blue carpet (l) = 5 m
Breadth (b) = 2 m
Width of red border = 25 cm
ML Aggarwal Class 7 Solutions for ICSE Maths Chapter 16 Perimeter and Area Ex 16.1 Q10
Inner length = 5 – \frac { 2\times 25 }{ 100 } = 5 – 0.5 = 4.5 m
and breadth = 2 – 0.5 = 1.5 m
Now area of carpet = 4.5 × 1.5 m2 = 6.75 m2
and area of border = 5 × 2 – 6.75 m2 = 10 – 6.75 = 3.25 m2
Now ratio between border and carpet (blue part) = 3.25 : 6.75 = 13 : 27

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