Answer:
1.5 cm
Step-by-step explanation:
[tex]pq = 6 \: cm[/tex]
[tex]pr = 4.5 \: cm[/tex]
Finding out QR:
[tex]qr = pq - pr[/tex]
[tex]qr = 6 - 4.5[/tex]
[tex]qr = 1.5[/tex]
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