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For instance, in triangle ABC, how to notate the side AB? Since, as far as I know, to notate the length of the side $AB$, we simply write $AB$ and I presume that we cannot notate the side AB as $AB$ since it is different to the length of the side AB. I also presume that we use the symbol $\overline {AB}$ since the side AB in triangle ABC is a line segment.

Correct me if I am wrong

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1 Answer

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$AB,BC,AC$ are nice notations, often the following notation is used

• $a$ for side $BC$
• $b$ for side $AC$
• $c$ for side $AB$

and

• $\alpha$ angle in $A$
• $\beta$ angle in $B$
• $\gamma$ angle in $C$

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