It depends on the length of the sides and the degree of the angles. If L1=L2=L3, and <a=<b=<c, then it is a regular polygon. Can you read algebraic expressions? If you can't, get someone who can. <br>
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irregular triangle
No because an equilateral triangle is a regular polygon whereas an obtuse triangle is irregular
For example, you can divide the polygon into triangles, and calculate the area of each triangle.
Any polygon can have at least one right angled - for example a right angled triangle. An example of an irregular polygon with only right angles is a rectangle.
-- trapezoid -- triangle -- irregular quadrilateral -- pentagon -- hexagon etc.