Triangle is orgiginate by three sides. So, it's name is start with 'tri' word.
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NO such 2-dimensional figure.
As the name implies a triangle (trigon) MUST have three(3) sides.
From Latin ; 'tri' = three (3).
None because all triangles have 3 sides and 3 interior angles that add up to 180 degrees
All 3 sides of an equilateral triangle are equal in length Only 2 sides of an isosceles triangle are equal in length
An isoceles triangle has only 2 equal sides and angles. An equilateral triangle has three of each. Any regular polygon has at least 2 equal sides and angles.
An isosceles triangle has 2 equal sides, a equadrilateral triangle has all equal sides, and a scalene has no equal sides
What triangle that has 2 equal sides
They all have 3 sides but an equilateral triangle has 3 equal sides, an isosceles triangle has 2 equal sides and a scalene triangle has no equal sides.