In triangle ABC, < A=25 degrees and < C=55 degrees, What are the approximate measures of the remaining side lengths of the triangle?

Sum of angles in a triangle will always be 180°, no matter the type of triangle.

Sum of angles in triangle = 180° = < A + < B + < C

= 25° + < B + 55°

180° = 25° + < B + 55°

Subtract 25° and 55° from each side of the equation,

180° - 25° - 55° = < B

100° = < B

Thus, < B = 100°

It is impossible to determine the exact lengths of this triangle as there are no known lengths given in the question.