equilateral triangle , isosceles triangle , scalene triangle
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to construct a triangle, we need 3 parts / elements out of which one should be a side
A triangle has 6 parts ... 3 sides and 3 angles. It's possible for two triangles to have as many as 3 of their parts congruent, and the triangles still not be congruent.
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A polygon that has 3 sides 2 of which are of equal length and 3 interior angles 2 of which are of equal measure.