RD Sharma Solutions Class 6 Mensuration Exercise 20.1

RD Sharma Solutions Class 6 Chapter 20 Exercise 20.1

RD Sharma Class 6 Solutions Chapter 20 Ex 20.1 PDF Free Download

Exercise 20.1

Question 1. Which of the following are closed curves? Which of them are simple?

(i)

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(ii)

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(iii)

(iv)

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(v)

Answer:

Figure (ii), (iii), (iv), (vi), and (vii) are closed curves, whereas Figure (ii), (iii), (iv) and (vi) are simple closed curves.

Question 2. Define perimeter of a closed figure.

Answer:

The length of the boundary of a closed figure is known as its permieter.

Question 3. Find the perimeter of each of the following shapes:

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Answer: Perimeter = Sum of lengths of all sides os a closed figure

(i) Perimeter = ( 4 + 2 + 1 + 5) cm = 12 cm

(ii) Perimeter = (23 + 35 + 40 + 35) cm = 133 cm

(iii) Perimeter = (15 + 15 + 15 + 15) cm = 60 cm

(iv) Perimeter = (3 + 3 + 3 + 3 + 3) cm = 15 cm


Practise This Question

What is the shape of the cross-section obtained when you horizontally cut the object below?