Suppose we have two line segments

Which one is bigger?

By seeing, we can see that (CD) is bigger than (AB)

Let’s take another example

Which one is bigger ?

Some will say (AB) , some will say (CD)

So, it is not obvious whether (AB ) is bigger or (CD)

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This is because we see differently and our judgment of length is not accurate.
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So, we have to use another method.

Let’s try comparing by tracing paper

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