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Next I slice from the line segment AC to the vertex E to form the solid figure ABCE that you described. The solid figure ABCE can be described as follows. Take a triangle ABC in the plane and a point E not in the plane. Join each point on the perimeter of the triangle to the point E to form the boundary of solid ABCE. The volume of the solid ABCE can be found from a surprising geometric theorem.
Thus the volume of the solid ABCE is (1/3) × (area of triangle ABC) × h. Hence the volume of ABCE is one third of the volume of the wedge. Harley  


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