Question

triangle ABC similar to triangle PQR , A(∆ ABC )= 9 CM square and A(∆PQR) =16 cm square if BC=2.1 cm then find the length of segment QR​

Answer 1

Answer:

2.8

Step-by-step explanation:

9/16=3^2/4^2

3/4

3/4=2.1/x

x=4×2.1/3

=2.8

Answer 2

Answer:

QR is 2.8 cm.

Step-by-step explanation:

A ( ∆ ABC ) / A ( ∆ PQR ) = BC × BC / QR × QR ------ theorem of areas of similar triangle

9 / 16 = ( 2.1 × 2.1 ) / QR × QR

9 / 16 = 4.41 / QR × QR

4.41 × 16 / 9 = QR × QR

7.84 = QR × QR

QR × QR = 7.84

QR = 2.8