Tetrahedron or triangular pyramid.
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it is a 3 dimentional triangle ... it can be a pyramid with 5 sides ... or one with four sides
2D - the triangle 3D - the tetrahedron (i.e. it has a triangle on each side and there are 4 sides.
It depends on the axis around which the triangle is rotated to generate the 3-d version. If rotated about the hypotenuse, you would get a circular wedge. If either of the other sides, you would get a cone.
No because it is a 2 dimensional triangle having 2 equal sides and 2 equal base angles