### Theory:

A three sided polygon is called a triangle. It contains three vertices, three sides and three angles. Triangle is the polygon with the least number of sides.

**Vertices:**\(A\), \(B\) and \(C\)

**Sides:**\(\overline {AB}\), \(\overline {BC}\) and \(\overline {CA}\)

**Angles:**\(\angle A\), \(\angle B\) and \(\angle C\)

A triangle is also associated with \(3\) parts:

refers to the inside/inner area of a triangle.**The interior of a triangle**refers to the line which divides the interior and exterior part.**The boundary****of a triangle**refers to the outside / outer area of a triangle.**The exterior****of a triangle**

Parts of a triangle: |