Question

angle ABC similar angle PQR. area of triangle ABC =49, area of triangle PQR =121. BC=10.5 find out QR. ​

Answer 1

Answer:

Step-by-step explanation:

We know that the ratio of the areas of two similar triangles is equal to the ratio of the squares of the corresponding sides.

∴  

ar(ΔPQR)

ar(ΔABC)

​

=  

QR  

2

 

BC  

2

 

​

⇒  

121

64

​

=  

(15.4)  

2

 

BC  

2

 

​

 

⇒  

11

8

​

=  

15.4

BC

​

 

⇒BC=  

11

8×15.4

​

=11.2cm