Prefix tri means three
so a tricycle has three wheels
or a triangle has three sides.
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equilateral triangle , isosceles triangle , scalene triangle
nonononono
a perpendicular line.
hi felicia
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.