Due to the cast molding. If the molding is a regular rectangular trapezoid, there is a tendency that the bar will be stocked (constricted) on the sides of the molding when being cast out, while in a trapezoidal prism, the bottom will not cause any constriction thereby the bar will easily slide out of the molding.
Cuboids.
In geometry, the octagonal prism is the sixth in an infinite set of prisms, formed by square sides and two regular octagon caps. Pencils and kaleidoscopes are shaped like octagonal prisms.
Spectrums
A gold bar is typically rectangular in shape, like a deliciously shiny chocolate bar without the calories. It's all about that bling-bling right angles, baby. So, if you're looking to invest in some gold, just remember: it's hip to be square.
which state is shaped like a glove
Cuboids.
Some ice crystals (snowflakes).
Rectangular
In geometry, the octagonal prism is the sixth in an infinite set of prisms, formed by square sides and two regular octagon caps. Pencils and kaleidoscopes are shaped like octagonal prisms.
You cannot have a trapezoidal cylinder. That is like a square circle - an impossible shape.
Triangler Prisms are like chocolate bars
A solid piece of glass shaped like a wedge is called a prism. Prisms are often used in optics to disperse light into its constituent colors or to reflect light at different angles.
Epsom salt appears as colorless, clear crystals that are often shaped like small prisms or needles. It has a characteristic bitter taste and a granular texture similar to table salt.
some decorative household items, roofs on some houses, pyramids, pencil points, tent, and crayon points are in the shape of triangular prisms
Spectrums
A dovetail jig is used to create dovetail joints. The male and female fittings of dovetail joints have a trapezoidal shape to create a tight fit when pieced together.
A teardrop earring is an earring shaped like a teardrop, typically with a butterfly or fish hook clasp. A gold teardrop earring is a teardrop earring made of gold.