a plane triangle is a normal triangle, like the isosceles, right angled, equilateral and scalene triangle.
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A triangle is a plane figure so it has two dimensions: length and breadth.
yes it does
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.
ones that can be drawn in the plane such as a triangle, circle, etc. A sphere is not one.
If you were to have 3 points on the same line, then you would actually not be determining a plane, because there are infinitely many planes that can intersect a given line. But if you have 3 points in the form of the points (or vertices) of a triangle, then you determine a plane in the sense that there is only one possible plane upon which that triangle can be drawn (not including a degenerate triangle, which is equivalent to a line).