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The 3rd side is 7p +4q +10r
Step-by-step explanation:
Let the sides of the triangle are L1, L2 & L3 and its perimeter be P
Given : L1 = 5p + 3q - 4r, L2 = 6p + 5q + 7r,
P = 18p + 12q + 13r
We know that perimeter of a triangle is given by :
P = L1 + L2 + L3
18p + 12q + 13r = (5p + 3q - 4r) + (6p + 5q + 7r) + L3
L3 = 7p +4q +10r
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