Base x height x .50
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If its acute angles are different then it is not a regular polygon but if it has 3 equal acute angles of 60 degrees then it is a regular equilateral triangle
A regular triangle is an equilateral triangle. It can also be be called equiangular but that term is not used much.
not necessarily... it can be any triangle.
An equilateral triangle, a square and a hexagon.
A regular triangle (aka equilateral triangle) has three lines of symmetry - these are its medians, In general, a regular n-gon has n lines of symmetry.