Question

how to further solve this

Answer 1

see the image....hope u understand

Answer 2

$\frac{9}{16} = \frac{4.5 ^{2} }{{ QR ^{2} }} \\ { QR ^{2} } = \frac{4.5 \times 4.5 \times 16}{9} \\ { QR ^{2} } = 36 \\ QR = 6$