Question

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Answer 1

Answer:

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Answer 2

Solution

Let the third side be x

we know that,

perimeter of triangle = sum of all sides

$7 {p}^{2} q + 13r = 14r + 2 {p}^{2}q - 4r + x \\ = > x = 5 {p}^{2} q + 17r - 14r \\ = > x = 5 {p}^{2} q + 3r \\ \\ Therefore, \: Third \: side \: is \: 5 {p}^{2} q + 3r$