A triangle has 3 edges and 3 corners. Depending on what kind of triangle it is decides what angles they are.
Hope this helped a little. :)
(You can always draw a picture that always helps me)
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3 vertices, 3 edges and 1 face.
An edge is the set of points where two (or more) planes meet. Since a triangle must be in just one plane, it cannot have any edges. It has one face, which is part of the plane containing the triangle.
Oh, dude, an equilateral triangle has 3 vertices, 3 faces (which are also the sides), and 3 edges. It's like the most balanced shape ever, so chill.
4 faces/ 4 vertices/ 6 edges
6