It depends on what information you have. There are formulae for when you have the lengths of all three sides or two sides and the angle between them.
If you have only one side and two angles (implicitly all three) you can calculate the lengths of the other sides.
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An equilateral triangle is a regular shape because it has 3 equal sides.
A tetrahedron is not an irregular triangle, it is a three dimensional shape, the simplest form of pyramid, with 4 triangular sides.
It could be any irregular shape whose sides add up to 36cm as for example a scalene triangle
An irregular shape like the delta or triangle( not equilateral) oblong (rectangle).....
Circle, triangle, oval, ellipse, & irregular shapes