An equilateral triangle is a regular shape because it has 3 equal sides.
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An equilateral triangle.
An irregular shape like the delta or triangle( not equilateral) oblong (rectangle).....
An equilateral triangle.
Each body has its own centre of gravity. The centre of gravity of two regular shapes - an equilateral triangle and a square will be different so why should the cog of a regular and an irregular shape not be different?
Regular Tetrahedron