a sphere
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A 2D shape is flat and only has a surface area whereas a 3D shape is an object that has surface area and volume.
There can be no closed 3D shape with only one square and 3 triangles.
A pentagon is a 2D shape. Volume and Surface Area is only found in 3D shapes.
a face.
Only one; a triangle is a 2D shape, not a 3D shape. Usually only 3D (or more) shapes are considered to have 'faces'.