Q:

# How many vertices does a triangle have?

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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

• A:

A cylinder has zero vertices. A cylinder does not have a vertex because there is no point where two lines meet. This is because a cylinder, unlike a prism, has circular faces; there is no corner where two straight lines meet.

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• A:

A pentagonal prism has 10 vertices because there are two five-sided shapes at both ends of a prism. A pentagonal prism has 15 edges and seven faces. Five faces are between the pentagons on each end.

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Rectangular prisms have eight vertices. They also have six faces and 12 edges. "Vertices" is the plural of "vertex," which is defined as the point where three or more faces come together to form a point or a corner, in terms of polyhedrons