Discussion

Explanation:

PQ = PE + FQ – FE
= radius of circle 1 + radius of circle 2 – FE = 20 + 20 – 12 = 28
Similarly, QR = 20 + 20 – CD = 40 – 10 = 30 and PR = 20 + 20 – AB = 40 – 5 = 35
So perimeter of ΔPQR = 28 + 30 + 35 = 93

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