Answers:

QR = 13 cm

PQ = 8 cm

Solutions:

P,Q and R are Collinear means they're at the same line.

Solution for QR:

• PR is 21 cm, then subtract 8 from 21.
• 21 - 8 = 13

Solution for PQ:

• PR is 21 cm, then subtract 13 from 21.
• 21 - 13 = 8

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