Question

∆ABC ~ ∆PQR,
9×A(∆PQR) = 25 ×A(∆ ABC).
If QR = 30, then find BC.​

Answer 1

arc(△PQR)

arc(△ABC)

=

QR

2

BC

2

⇒

49

25

=

(9.8)

2

BC

2

⇒

7

5

=

9.8

BC

⇒BC=

7

9.8×5

=7.0cm

2