Introduction - Mensuration Class 8th Maths NCERT Chapter 11

Introduction - Mensuration Class 8th Maths NCERT Chapter 11

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About this video:- In this lecture Vineet Sir is going to teach you about Mensuration.
Mensuration Class 8th Maths NCERT Chapter 11 - INTRODUCTION
Mensuration - Introduction for Class 8th mathematics chapter 11
Mensuration class 8th formulas
mensuration class 8 NCERT introduction
mensuration class 8 ncert

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11.1 Introduction
We have learnt that for a closed plane figure, the perimeter is the distance around its boundary and its area is the region covered by it. We found the area and perimeter of various plane figures such as triangles, rectangles, circles etc. We have also learnt to find the area of pathways or borders in rectangular shapes. In this chapter, we will try to solve problems related to perimeter and area of other plane closed figures like quadrilaterals. We will also learn about surface area and volume of solids such as cube, cuboid and cylinder.
11.2 Let us Recall
Let us take an example to review our previous knowledge. This is a figure of a rectangular park (Fig 11.1) whose length is 30 m and width is 20 m.
(i) What is the total length of the fence surrounding it? To find the length of the fence we need to find the perimeter of this park, which is 100 m. (Check it)
(ii) How much land is occupied by the park? To find the land occupied by this park we need to find the area of this park which is 600 square meters (m2) (How?).
(iii) There is a path of one metre width running inside along the perimeter of the park that has to be cemented. If 1 bag of cement is required to cement 4 m2 area, how many bags of cement would be required to construct the cemented path?
We can say that the number of cement bags used = area of the path area cemented by 1 bag.
Area of cemented path = Area of park – Area of park not cemented. Path is 1 m wide, so the rectangular area not cemented is (30 – 2) × (20 – 2) m2. That is 28 × 18 m2. Hence number of cement bags used = -----------------
(iv) There are two rectangular flower beds of size 1.5 m × 2 m each in the park as shown in the diagram (Fig 11.1) and the rest has grass on it.
Find the area covered by grass.
Area of rectangular beds = -----------------
Area of park left after cementing the path = -----------------
Area covered by the grass = -----------------
We can find areas of geometrical shapes other than rectangles also if certain measurements are given to us . Try to recall and match the following:
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[NishaPandey-wkrb]

I'm glad that I find this channel....only I know how anxious I was being because of this chapter no byjus no pw idk why....no one was giving me that satisfaction but this channell❤ ohh I hav2 my mths tomorrow thnkkkyuhhh sir

[pawangupta-llne]

Agar koi teacher Acha padhate h to students ka ye farj h usko like karke unka himat majbut banaye

[mathematicsworld]

Area of parallelogram is base into height