Equiangular Polygon is not necessarily Equilateral

Theorem

Let $P$ be an equiangular polygon with more than $3$ sides.

Then it is not necessarily the case that $P$ is also equilateral.

Proof

Proof by Counterexample

We take as an example the rectangle:

A rectangle is a quadrilateral all of whose angles are equal to a right angle, and whose sides may or may not all be the same length.

$\blacksquare$

Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): polygon
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): polygon