A mathematical statement that contains an = sign is called an equation.
ex:
2x +5 is a statement, this is NOT an equation.
2x +5 = 10
this IS an equation, because it has an = sign.
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i don't get the joke. kidding. an equilateral triangle
Well its still a 2d because its like a normal square
A triangle with 3 equal sides is an equilateral triangle. A triangle with 2 equal sides is an isosceles triangle. There is no such thing as a triangle with ONE equal side. Equal to what? If you wish to stretch it and say each side is (equal to itself only ) not equal to any others it is a scalene triangle.
There is no specific name, except in the case of a triangle: scalene. You should not call it simply an irregular polygon, because a regular polygon implies that ALL sides are equal and ALL angles are equal. So a rhombus, where all four sides are equal, is still irregular.
A shape with 100 sides is called a hecatontagon. The prefix "hecto-" means 100 in Greek, so a hecatontagon is a polygon with 100 sides. It is a regular polygon, meaning all its sides are of equal length and all its angles are equal.