Triangle Side Verification: Is DC a Side of Triangle BDC?

Let's determine if DC is a side of triangle BDC:

First, we need to identify the triangle BDC:

• Vertices of triangle BDC are: $B, D,$ and $C$.
• Sides of triangle BDC are the line segments that connect these points. Namely, these sides are $BD, DC,$ and $BC$.

Since $DC$ is one of the line segments connecting the vertices of triangle BDC, it indeed constitutes one of its sides.

Therefore, we conclude that the statement is true: DC is a side of the triangle BDC.