Q:

# How many vertices does a triangle have?

A:

A triangle has three vertices. A triangle consists of three lines, and the location where one line endpoint meets another line endpoint is called a vertex. A square consists of four vertices, while an octagon contains eight vertices.

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Credit: Sarah Witherby CC-BY-SA 2.0

Any polygon has the same number of vertices as it does sides; this is a constant that never changes, no matter how many lines are introduced into a polygonal shape.

A collinear vertice refers to a set of points that lie on the same straight line.

Triangles are classified by the length of their sides and by the interior angles of the corners.

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## Related Questions

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A person draws a hexagon by drawing a closed polygon with six sides and six vertices. A regular hexagon has six equal sides and six equal angles. A person can draw a regular hexagon using a geometric construction.

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A triangular pyramid has four vertices. A square pyramid has five vertices. Other pyramids have a greater number of vertices depending on the shape of the base.

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A diagonal is a line between two vertices of a polygon that is also not a side of the polygon, and a quadrilateral is a four-sided polygon. Veritces are the points where sides of a polygon meet, and a polygon is an enclosed figure formed by three or more line segments. Using the diagonal formula n(n-3) / 2 where n is the number of sides, each quadrilateral has two diagonals.