Minimizes the residual stress of the casted product. Also safety.
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Yes, a trapezoidal prism is a polyhedron. A polyhedron is a solid three dimensional object with flat face, straight edges and sharp corners.
Well, honey, an ellipse technically has zero sides and zero corners. It's a curved shape, not a polygon. So, if you're looking for straight edges and sharp corners, you're barking up the wrong tree with an ellipse.
Adjacent corners of a square share one side. Opposite corners share no sides.
3 faces and 8 corners
A triangle is the only polygon with 3 corners (vertices). There is no polyhedron with 3 corners.