The perimeter of a triangle is 100 cm. If the length of the sides are (7a 4) cm and (2a + 8) cm, find the length of the third side.\
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Given two sides, we have to find the third side.
7a + 4 + 2a + 8 + x = 100
9a + 12 + x = 100
x = 88 - 9a.
Therefore the required side is 88 - 9a
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