why is the word rectangular prism called rectangular prism?
150758
to indicate a solid shape wich has the same rectangular section on each planar parallele to its rectangular base.\nIt has two congruent rectangular faces and four lateral sides shaped as parallelograms (eventually rectangles)\n\nIf all the faces are rectangles, then it's called a parallelepiped
559607
A rectangular prism is simply made up of 6 rectangles.  One pair of rectangles would be 3cm x 3cm (the ends).  The other 4 rectangles would be 3cm x 20cm.  So the total surface area would be the sum.\n\n3cm x 3cm = 9 sq. cm\n3cm x 20cm = 60 sq. cm\n\nSo 9 + 9 + 60 + 60 + 60 + 60 = 258 sq. cm.\n\nIn this case two of the dimensions were the same, but if the sides were h,w,l the total surface area would be:\n= hw + hw + hl + hl + lw + lw\n= 2hw + 2hl + 2lw\n= 2 (hw + hl + lw)\n\nIn your example:\n= 2 (3x3 + 3x20 + 3x20)\n= 2 (129)\n= 258 sq. cm.   (Don't forget the units are sq. cm)
818692
They are both base times height; however, in a rectangle the base and height are always sides of the rectangle and in non-rectangular parallelograms, one of them will not be the same as a side.
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Hint: Try cutting square prisms that are 1x1x4.  You can cut them out in a certain way so that you are left with a square prism. Try to find out how to do this on your own. If you're still stuck, ask again (or wait for a more thorough respnse). As a teacher, I encourage you to figure it out; it is better for your education.
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Sorry but clear isn't a colour. And i think  a prism is a refraction of light not a reflection.In optics, a prism is a device used to refract light, reflect it or break it up (to disperse it) into its constituent spectral colours (colours of the rainbow). The traditional geometrical shape is that of a triangular prism, with a triangular base and rectangular sides. Some types of optical prisms are not in fact in the shape of geometric prisms.\n\nAs light moves from one medium (e.g. air) to another denser medium (the glass of the prism), it is slowed down and as a result either bent (refracted) or reflected. The angle that the beam of light makes with the interface as well as the refractive indices of the two media determine whether it is reflected or refracted, and by how much (see refraction, total internal reflection).\n\nReflective prisms are used to reflect light, for instance in binoculars, since they are easier to manufacture than mirrors. Dispersive prisms are used to break up light into its constituent spectral colours because the refractive index depends on frequency (see dispersion); the white light entering the prism is a mixture of different frequencies, each of which gets bent slightly differently. Blue light is slowed down more than red light and will therefore be bent more than red light. There are also polarizing prisms (also known as birefringent prisms) which can split a beam of light into components of varying polarization.\n\nIsaac Newton first thought that prisms split colours out of colourless light. Newton placed a second prism such that a separated colour would pass through it and found the colour unchanged. He concluded that prisms separate colours. He also used a lens and a second prism to recompose the rainbow into white light.
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The oblique answer is correct. As for the slanted 3-D rectangle, I believe you are referring to a parallelepiped: http://mathworld.wolfram.com/Parallelepiped.html .
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A right rectangular prism has six faces.
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All squares are rectangles,\nall parallelograms are quadrilaterls\nand all squares are parallelograms
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Tungsten, or in German, Wolfram. This is why the symbol is W.
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If you use a shape instead of a circle at the top and bottom of a cylinder, then it will cease to become one.\n\nIf you substitute triangles in place of the circles, you will end up with a prism.\n\nIf you substitute squares or rectangles in place of the circles, you will end up with a cuboid or cube.
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The word Window originates from the Old Norse vindauga, from vindr "wind" and auga "eye." It is first recorded in the early 13th century, and originally referred to an unglazed hole in a roof.\n\nWhen you consider its origin, it is pretty easy to understand why it was called a window. Maybe you two can let it rest now.
128959
uuuuuhhhhhh, no. a polygon is a MULTI-SIDED figure. hence the POLY prefix, meaning many.
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If you are talking about a 3-D rectangle,\n\nThe volume of a rectangle is height times width times depth.  \n\nYou can also use base times height if its easier.\n\nhope this helps!
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Perimeter of the triangle multiplied by the height of the prism.
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Use a prism like Newton did.
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It is a triangular prism. It has 5 faces, 9 edges, and last but not least 6 vertices. There is your answer you have been waiting for this whole time!
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Periodic???\n\nTake Periodic as a dictionary word. This reflects a cyclic repetition.\n\nIn case of elements periodic means repetition of properties after a complete cycle.\n\nMendeleev and other scientists found that there is a repetition of properties of elements after eight elements so initially a period of eight elements was formed.\nTransition elements were inserted on a later stage.\n\nThe horizontal columns are called periods because they represent the cycle of PERIODICITY OF PROPERTIES OF ELEMENTS.\n\nGroups are called groups because they contain elements of similar properties; as obtained because of periodicity.