Question

here is a graph.
finish the graph below so that it is equivalent to the graph to the left.

Explanation:

Identify the vertices and edges of the original graph

$$
LATEXBLOCK0
$$

Identify the existing elements in the target graph

$$
LATEXBLOCK1
$$

Note: The original graph has only one edge between \(B\) and \(C\), but the target graph shows two curved edges and one straight line through \(D\) connecting \(B\) and \(C\). Specifically, the target graph has a straight segment \(B-D\), a straight segment \(D-C\), and two curved paths directly between \(B\) and \(C\). This means the connection \(B-D-C\) is already drawn, along with two direct edges between \(B\) and \(C\). To make the graphs equivalent, we must place vertex \(A\) and connect it to its adjacent vertices.

Determine the missing vertex and edges to complete the graph

$$
LATEXBLOCK2
$$

Answer:

To finish the graph so that it is equivalent to the original graph on the left:

1. Add the missing vertex \(A\) in the lower portion of the drawing area (below vertices \(B\), \(D\), and \(C\)).
2. Draw an edge connecting vertex \(A\) to vertex \(B\).
3. Draw an edge connecting vertex \(A\) to vertex \(D\).