4 ratio of areas of two similar triangles is 9 25 is the ratio of their corresponding sides

Solution:

The ratio of the areas of two similar triangles is equal to the square of the ratio of their corresponding sides

Given that,

Sides of two similar triangles are in the ratio 4: 9.

We know that,

The ratio of the areas of two similar triangles = square of the ratio of their corresponding sides

= (4: 9)2

= 16 : 81

Thus option (D) 16: 81 is the correct answer. 

☛ Check: NCERT Solutions for Class 10 Maths Chapter 6

Video Solution:

Sides of two similar triangles are in the ratio 4:9. Areas of these triangles are in the ratio (A) 2 : 3 (B) 4: 9 (C) 81: 16 (D) 16: 81

NCERT Class 10 Maths Solutions Chapter 6 Exercise 6.4 Question 9

Summary:

The sides of two similar triangles are in the ratio 4:9. Areas of these triangles are in the ratio 16: 81.

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Ratio of areas of two similar triangles is 9 : 25. _______ is the ratio of their corresponding sides.

3: 5

Let ΔABC and ΔPQR be two similar triangles.  

According to the given condition,

`"A(ΔABC)"/"A(ΔPQR)" = 9/25`      ...(Given)

But `"A(ΔABC)"/"A(ΔPQR)" = "AB"^2/"PQ"^2` ...(By the theorem of areas of similar triangles)

∴ `"AB"^2/"PQ"^2 = 9/25`

∴ `"AB"/"PQ" = 3/5`

∴ 3: 5 is the ratio of their corresponding sides. 

Concept: Areas of Two Similar Triangles

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