A regular heptagon has seven lines of symmetry. A regular heptagon is a seven-sided polygon with all sides and angles equal. Each line of symmetry in a regular heptagon passes through a vertex and the midpoint of the opposite side. Since there are seven vertices and seven sides, there are seven such lines.
To visualize this, imagine drawing a line from one vertex to the midpoint of the opposite side. This line will divide the heptagon into two mirror-image halves. Repeating this process for each vertex will result in seven distinct lines of symmetry.
In summary, the number of lines of symmetry in a regular heptagon is equal to the number of its sides, which is seven.