See the figure and find the ratio of
(a) Number of triangles to the number of circles inside the rectangle.
(b) Number of squares to all the figures inside the rectangle.
(c) The number of circles to all the figures inside the rectangle.

Solution:

We use the concept of ratio and proportion to answer the given questions.
From the given figure, we can infer that,
The total number of circles inside the rectangle = 2
The total number of triangles inside the rectangle = 3
The total number of squares side the rectangle = 2

The total number of all the figures inside the rectangle = The total number of circles inside the rectangle + The total number of triangles inside the rectangle + The total number of squares side the rectangle = 2 + 3 + 2 = 7
Therefore, the total number of all the figures inside the rectangle = 7

(a) We need to find the number of triangles to the number of circles inside the rectangle.
The number of triangles to the number of circles inside the rectangle = The total number of triangles inside the rectangle: The total number of circles inside the rectangle = 3:2
Therefore, The number of triangles to the number of circles inside the rectangle = 3:2

(b) We need to find the number of squares to all the figures inside the rectangle.
The number of squares to all the figures inside the rectangle = The total number of squares side the rectangle: The total number of all the figures inside the rectangle = 2:7
Therefore, the number of squares to all the figures inside the rectangle = 2:7

(c) We need to find the number of circles to all the figures inside the rectangle. 
The number of circles to all the figures inside the rectangle = The total number of circles inside the rectangle: The total number of all the figures inside the rectangle = 2:7
Therefore, the number of circles to all the figures inside the rectangle = 2:7

NCERT Solutions for Class 6 Maths Chapter 12 Exercise 12.1 Question 3

See the figure and find the ratio of (a) the number of triangles to the number of circles inside the rectangle. (b) Number of squares to all the figures inside the rectangle. (c) The number of circles to all the figures inside the rectangle

Summary: 

Using the concept of ratio and proportion, it can be concluded that the number of triangles to the number of circles inside the rectangle, the number of squares to all the figures inside the rectangle and, the number of squares to all the figures inside the rectangle are 3:2, 2:7 and 2:7 respectively.

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