Scalene triangles.
All three are different: Scalene
Two are the same: Isosceles
All three are the same: Equilateral
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Scalene triangles
Scalene triangles are polygons like all triangles. The lengths of the sides of scalene triangle are all different.
Equilateral triangles have 3 sides all of the same lengths and the three angles are equal (60°). Isoceles triangles have two sides of equal length with both of those side angles being equal while the other is different. Scalane triangles have all sides of different lengths and different angles. Right angled triangles have one angle of 90° and the other two will total 90°.
Yes. Corresponding angles of the two triangles are always equal, and lengths of corresponding sides are always in the same ratio.
Only when they are equilateral triangles and regular hexagons that both will have sides of equal lengths.