In a regular pentagon, all sides and angles are equal. This is not true for irregular pentagons. A regular pentagon has five sides of the same length.
Pro Tip 2/3
Shape Attributes
The term 'pentagon' refers only to the number of sides and angles, not their lengths or angles' sizes. A drawing of a house often includes an irregular pentagon to represent a door.
Pro Tip 3/3
Math Usage
In math contexts, 'pentagon' often implies a regular pentagon unless specified otherwise. To calculate the area, remember that this is a regular pentagon.