The missing length of the triangle is 22.
What is the missing length indicated?
It follows from the complete question that the triangle given and the missing length (longest side) can be calculate by means of the proportional as follows;
5/ 15 = 11/ (11+ x)
By cross multiplication;
5 (11 + x ) = 15 (11)
55 + 5x = 165
5x = 165 - 55
5x = 110
x = 22
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