The measure of a triangle's sides and angles relative to each other can be indicated using tally marks and arcs. Thus, the three interior angles for △ABC above are A, B, and C. These angles share the same name as their vertices. Referencing the above triangles, an interior angle is formed at each vertex of a triangle. In the triangle above, the lower case letters are the sides and the upper case letters are their opposing angles. Triangle sides can also be labeled based on its opposing angle: The sides of the triangle above are named using the line segments between vertices: AB, BC, and AC. One way that triangles are named is by labeling their vertices using either lower case or upper case letters, as shown in the figure below: Various notation are used to label triangles. Median - The line segment joining a vertex of a triangle to the midpoint of the side opposite the vertex.Exterior angle - The angle formed outside a triangle by extending a side.Interior angle - The angles formed inside a triangle by its vertices.Altitude - The perpendicular line segment formed between the vertex of a triangle and the side opposite the vertex.Base - The bottom side of a triangle (any side can be the base.).For a triangle, an angle is formed at each vertex.
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