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Q: What has a circular cross section when the cross section is taken parallel?

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The cross section of a sphere is most often a circle. When the cross section is taken parallel to the base of a cylinder, it is also a circle.

A cone or a pyramid.

A pyramid or cone.

It could easily be taken for a trapezoid.

A circle is a 2 dimensional shape; it has a length and a height (the same, essentially), but no width. Since a circle has no width (or "depth"), it cannot exist in real life (only drawn on paper). (Even if you cut out the circle drawn on the paper, it would still have the width of the paper as a dimension, which would make it not a circle, by definition.)There are some "cylindrical" objects in real life (which have a length, height and depth, so are 3D) but these are not the same as "circles"(cylindrical objects are allowed to have a width/depth, but circles cannot by definition). Examples of cylindrical objects include sellotape reels, wheels and other objects that have 2 circular faces and a curved surface in between.The similar to a circle is a sphere - a sphere is an object where if lots of cross sections were taken, the cross section would be circular. Examples are oranges, flowers, tomatoes, apples and balls.

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The cross section of a sphere is most often a circle. When the cross section is taken parallel to the base of a cylinder, it is also a circle.

Only if the section is taken by a plane parallel to one of the faces.

A solid with a triangular cross section when the cross section is taken parallel to the base could be either a triangular prism, a triangular pyramid, or a triangular frustrum.. I've been sitting here trying to convince myself (without actually bearing down and trying to prove it mathematically) that any cross section of a regular tetrahedron (a special case of triangular pyramid) taken perpendicularly to the base is a triangle, and I THINK this is the case, but as I said I certainly haven't rigorously proven it; I'm just unable to come up with any obvious situation where this is not true.

The vertical cross section of a right vertical cone is a triangle if that cross section is taken from the vertex. Any other vertical cross section will reveal a hyperbola (with endpoints on the base of the cone). A link can be found below.

The answer depends on the orientation of the pipe and the cut. Even if the cut is vertical, it can be along the axis (length) of the pipe, at right angles to it or at a slant. If the cut is along the axis, the cross section will be two rectangles where the length of the rectangle is the length of the pipe and the width is the thickness of the pipe. If the pipe has negligible thickness, this may be taken to be two parallel lines. If the cut is at right angles to the axis then the cross section will be an annulus which, when the thickness is negligible will become a circle. Finally, if the cut is skew, then you will get ellipses which will collapse to a single ellipse for negligible thickness.

similar

pyramid

A cone or a pyramid.

A tapered prism.

A pyramid or cone.

No. Some of the classic curves studied by mathematicians: ellipses, hyperbola are cross sections of a cone taken at an angle.

MCM is another measure of wire gauge. It is somewhat confusing but it starts at around 40 gauge being the smallest wire up to the largest gauge of 1. from there you have oughts which is from 1 to 4 (1 ought, 2 ought etc) and then you have MCM which is circular mils. MCM can range from something as small as 250 mcm up to 2000 mcm.Another AnswerThe abbreviation, 'MCM', stands for 'thousand circular mils'. A 'circular mil' is a North-American method of measuring the cross-sectional area of a circular-section conductor (Europeans use square millimetres for conductors of anyshape).A 'circular mil' is obtained by squaring the diameter of a circular-section conductor, expressed in mils. A 'mil' is one-thousandth of an inch. As the constant, 'pi', isn't taken into account, it should be obvious that a circular mil is, therefore, a figure representing a cross-sectional area, rather than a true measure of that area.If necessary, in order to obtain a true cross-sectional area, circular mils can be converted into square mils.

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