Triangle ABC: Identifying the Side BC in a Given Geometric Figure

True or false:

BC is a side of triangle ABC.

To solve this problem, we must determine whether BC is indeed a side of triangle ABC. A triangle consists of three vertices connected by three line segments that form its sides.

Firstly, observe the triangle labeled in the diagram with vertices A, B, and C. For triangle ABC, the sides are composed of the segments that connect these points.

• The three line segments connecting the vertices are:
  • $AB$, connecting points A and B;
  • $BC$, connecting points B and C; and
  • $CA$, connecting points C and A.

Among these, BC is clearly listed as one of the segments connecting two vertices of the triangle. Therefore, BC is indeed a side of triangle ABC.

Hence, the statement is True.