A square
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octagon
A rhombus. (Which is in fact also an equilateral parallelogram)
A cone has no acute angles because a cone is a 3D shape and not a 2D.
A television set is a 3D shape. The image (picture) on the television screen is a 2D shape. 3D is when it has length, width, and height. 2D is only length and width.
Well its still a 2d because its like a normal square