What are regular and irregular shapes?
The definition of a regular shape is that all the sides are equal and all the inside angles are equal. An irregular shape doesn’t have equal sides or equal angles.
For example, an equilateral triangle is a regular shape because all the sides are equal AND all the angles are equal. A right angle triangle is an irregular shape, because although it is a shape that we recognise instantly, it has different length sides and different inside angle measurements.