Triangle
<p>A triangle ABC = {A B C} is <i>a set of three points</i>. (The absence of commas indicate the absence of ordering.)
 
The triangle ABC has three sides:
AB, AC, and BC (direction is not included)</p>
<p>A triangle ABC = {A B C} is <i>a set of three points</i>. (The absence of commas indicate the absence of ordering.)
 
The triangle ABC has three sides:
AB, AC, and BC (direction is not included)</p>