I don't think there's a three dimensional rectangle, and if the two dimensional triangle exists in three dimensional space, it would have strange properties because it only has 4 edges. There however, a three dimensional rectangular prism. It has 12 edges.
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Every rectangle is two-dimensional. If it has three dimensions, or only one,then it's not a rectangle.If it really and truly is an authentic rectangle, then it has four sides.
A triangle has three edges; a rectangle has four.
Three pairs.
8 edges, 4 corners or vertices and 6 faces! :) * * * * * Not true. A rectangle is a 2-dimensional shape. It has four sides and four vertices (corners).
A three dimensional triangle is also known as a pyramid. In a triagonal pyramid, there are six edges and four corners.