# Definition:Triangle (Geometry)/Base

< Definition:Triangle (Geometry)(Redirected from Definition:Base of Triangle)

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## Definition

For a given triangle, one of the sides can be distinguished as being the **base**.

It is immaterial which is so chosen.

The usual practice is that the triangle is drawn so that the **base** is made horizontal, and at the bottom.

In the above diagram, it would be conventional for the side $AC$ to be identified as the **base**.

## Sources

- 2014: Christopher Clapham and James Nicholson:
*The Concise Oxford Dictionary of Mathematics*(5th ed.) ... (previous) ... (next): Entry:**base**(of a triangle)