A polygon whose sides are the same length is called equilateral.^{[2]} The most commonly used equilateral polygon is the equilateral triangle. An equilateral quadrilateral is a parallelogram with equal sides. If the adjacent sides of an equilateral quadrilateral are perpendicular, the shape is a square. All regular polygons are equilateral.
The word equilateral is derived from Latin. Equi- is taken from the word aequus, meaning 'equal'. -lateral is taken from the word lateralis, meaning 'of the side'.
Click on the blue points and drag them to change the figure. The sides on these figures are always the same size, are always equilateral. |
Manipulative 1 - Equilateral Created with GeoGebra. |
# | A | B | C | D |
E | F | G | H | I |
J | K | L | M | N |
O | P | Q | R | S |
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