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Unit 12 Ex 12.1

This document contains the notes from a 5th grade math class on perimeter, area, and volume. It includes examples of calculating the perimeter of rectangles, squares, and triangles by adding the lengths of the sides. For squares, the perimeter is calculated as 4 times the length of a side. The examples provide the steps to solve for missing values like the length of a side if the perimeter is given. There are also word problems involving finding the perimeter of a square park and the width of a rectangular sheet of paper.

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274 views2 pages

Unit 12 Ex 12.1

This document contains the notes from a 5th grade math class on perimeter, area, and volume. It includes examples of calculating the perimeter of rectangles, squares, and triangles by adding the lengths of the sides. For squares, the perimeter is calculated as 4 times the length of a side. The examples provide the steps to solve for missing values like the length of a side if the perimeter is given. There are also word problems involving finding the perimeter of a square park and the width of a rectangular sheet of paper.

Uploaded by

Anonymous 824Q0SG6iD
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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UDGAM SCHOOL FOR CHILDREN

2021-2022
Class: V Subject: Math NOTEBOOK WORK Date:05-01-2022

UNIT- 12 PERIMETER, AREA AND VOLUME


EXERCISE: 12.1 (Pg. 97-99)

1. Find the perimeter of the rectangle whose lengths and breadths are given below:
b) Length = 21 m Breadth = 15 m c) Length = 110 cm Breadth = 80 cm
PERIMETER OF A RECTANGLE = 2 x (l + b)
Do yourself
= 2 x (21 m + 15 m)
= 2 x (36 m)
= 72 m
Ans: Perimeter of the Rectangle = 72 m.

2. Find the perimeter of the square whose side has length:

b) Side =12.5 m c) Side = 50 m

Perimeter of a square = 4 x l Do yourself

= 4 x 12.5 m
= 50.0 m

Ans: Perimeter of the square = 50 m

3. Find each side of the square if its perimeter is:

b) Perimeter = 10.8 cm c) Perimeter =160 cm

Side of a square = Perimeter ÷ 4 2.7 Do yourself


4 10.8
= 10.8 cm ÷ 4
= 2.7 cm
Ans: Side of the square = 2.7 cm.

4. ====== PLEASE DO IN TEXTBOOK ONLY =====

Please note the correction in figure (c) on page 98

10 cm

Class:5 /Subject – Math/ NOTEBOOK WORK Page 1


hetal.shah@udgamschool.com
5. Find the perimeter of the following Triangle:

b) XYZ in which; c) PQR in which PQ = 7.5 m,


XY =25 cm, YZ=19 cm and ZX= 30 cm QR=4.8 m RP= 6 m
Perimeter of a triangle = XY + YZ + ZX
= 25 cm + 19 cm + 30 cm
= 74 cm Do yourself
Ans: Perimeter of the Triangle = 74 cm.

QUES 6 AND 7 ====== TO BE DONE IN TEXTBOOK =====


SOLVE THE FOLLOWING :

2. Ajay covers a distance of 480 m when he completes one round of a square park.
What is the length of each side of the park? R.W
120
Perimeter of a square park = 480 m 4 480
Length of the side of the park = Perimeter ÷ 4
= 480 m ÷ 4
= 120 m
Answer: Length of each side of the park = 120 m

3. What would be the width of a rectangular sheet of paper whose length and
perimeter are respectively 22 cm and 76 cm.
Perimeter of a rectangular paper = 76 cm
Length of the paper = 22 cm

‫ ؞‬Width of the paper = (Perimeter ÷ 2) - L


= (76 cm ÷ 2) – 22 cm
= (38 cm) – 22 cm
= 16 cm
Answer: Width of the rectangular sheet of paper = 16 cm

5. Find the perimeter of an isosceles triangle, each of whose equal sides measure
6.2 cm and length of third side is 4.5 cm.
Two sides of an isosceles triangle = 6.2 cm each.
Third side of the triangle = 4.5 cm

‫ ؞‬Perimeter of the Triangle = sum of the three sides


= 6.2 cm + 6.2 cm + 4.5 cm
= 16.9 cm
Answer: Perimeter of the triangle = 16.9 cm
PLEASE NOTE : THE UNDONE QUESTIONS OF THIS EXERCISE SHOULD BE
DONE AS PRACTICE WORK BY YOURSELF.
Check your answers with the following answer key.

1 (c) 380 cm 2 (c) 200 m 3 (c) 40 cm 5 (c) 18.3 m


Class:5 /Subject – Math/ NOTEBOOK WORK Page-2
hetal.shah@udgamschool.com

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