Yes.
Four solid angles comprising 12 plane angles.
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None of the edges of a triangular pyramid is parallel to any of its other edges.
Yes it does! :)
A pyramid does not need to have any equal sides. A REGULAR pyramid has as many equal sides as the number of sides on the base. So, a triangular pyramid (tetrahedron) will have 3 equal faces, a square based pyramid will have 4, etc.
The base of any pyramid is simply one side!
The volume for any pyramid = 1/3*base area*perpendicular height