Since the two figures are similar, all the sides must be in ratio. So, looking at sides AB and PQ, we get the ratio 3/5.4. That has to be the same as BC and QR (5/x)

So, 3/5.4 = 5/x

Cross-multiply and you get 3x = 27; x = 9

Hope that helps!

thanks but how do you know which side to pick when doing this?

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