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In solid geometry, a wedge is a polyhedron defined by two triangles and three trapezoid faces. A wedge has five faces, nine edges, and six vertices. A wedge is a subclass of the prismatoids with the base and opposite ridge in two parallel planes. A wedge can also be classified as a digonal cupola. Comparisons: * A wedge is a parallelepiped where a face has collapsed into a line. * A quadrilaterally-based pyramid is a wedge in which one of the edges between two trapezoid faces has collapsed into a point. == Volume== For a rectangle based wedge, the volume is : where the base rectangle is ''a'' by ''b'', ''c'' is the apex edge length parallel to ''a'', and ''h'' the height from the base rectangle to the apex edge. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Wedge (geometry)」の詳細全文を読む スポンサード リンク
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