A pentagon (a shape with 5 sides). Just stack the shapes ontop of eachother.
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1 shape
Simply assemble the triangles in to a rectangle.
2
A 3-d shape with 6 equal faces is a cube. It has 6 squares as it's faces. A 3-d shape with 6 equal faces and only 2 squares is a rectangular prism. It has 2 squares and 4 other rectangles (squares are rectangles too) as it's faces.
A hexagon.