Question

what is the disadvantage in comparing line segments by mere observation​

Answer 1

Answer:

Comparing the lengths of two line segments by mere observation cannot tell us accurately that which line is shorter or which is longer.

By mere observation we can't compare the line segments with slight difference in their length. We can't say which line segment is of greater length.

When we compare two line segments of almost same lengths, we cannot be sure about the line segment of greater length. ... Therefore, this is the disadvantage in comparing line segments by mere observation.

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Answer 2

$\red \bigstar$Answer:-$\red \bigstar$

On comparing the lengths of line segments by mere observation the difference may not be obvious for all the pairs of line segments.