The length of line BE on the given line segment is 3.5 m.
The given parameters:
- <em>Length BD = 3 m</em>
- <em>Length CD = 15 m</em>
- <em>Length AB = 21 m</em>
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The sketch of the given line segments is presented in the diagram uploaded.
The length of BE is determined by applying similar triangle theorem as follows;
Thus, the length of line BE on the given line segment is 3.5 m.
Learn more about similar triangle here: brainly.com/question/11899908
