define
Interior angles
Triangle Angle Sum Theorem
Vertex
- Interior angles: The angles inside a polygon or a shape, such as a triangle or quadrilateral.
- Triangle Angle Sum Theorem: This theorem states that the sum of the interior angles of a triangle is always equal to 180 degrees.
- Vertex: A vertex is a point where two or more lines, line segments, or rays meet to form an angle. In a polygon, the vertices are the points where the sides of the polygon intersect.