An irregular decagon is a flat shape with 10 sides where the sides and angles are not all the same length or size. There are infinitely many different irregular decagons.
Unlike a regular decagon, the sides can be different lengths and the angles can be different sizes:
There are no rules about how long the sides must be or how big the angles must be (as long as all angles add up to 1,440° in total). This means the number of possible irregular decagons is infinite — every different combination of measurements gives a different shape.
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