wtf is a plane?

ryanairzer

Appled Maths book, rigid body rotation ex. 13 B.

Some of those questions mention the plane of the lamina, wtf is it?

ZorbaTehZ

The plane of the lamina is the plane that it is lying on, i.e. a plane parallel to the lamina and inside the lamina. Another way of defining it is by saying that the lamina itself is only a part of a plane - and that is the plane of the lamina.

PurpleFistMixer

Lololol.

Zorba's basically got it there, plane is like... if the lamina were to rest on a gigantic sheet of paper, the paper would be the plane, and if there was another gigantic sheet of paper sticking up perpendicular to it, that'd be another plane. Yeah.

jaycummins

a plane in applied maths and maths is like flat ground. there are two of them, the horizontal and the vertical, both perpindicular to eachother. (like in coordinate geometry in maths)

EamonnKeane

A plane is a flat surface and there are three, not two, and they are orthogonal (At right angles to each other): horizontal, vertical, and longitudinal.

aidan24326

EamonnKeane wrote: »

A plane is a flat surface and there are three, not two, and they are orthogonal (At right angles to each other): horizontal, vertical, and longitudinal.

Best answer yet but you're not quite right about there just being 3.

What you are talking about is the 3 planes x,y and z of standard co-ordinate geometry. The actual 'plane' can be thought of as the infinite two-dimensional infinitesimally thin flat surface, that given any two distinct points on the surface, the surface also contains the unique straight line that passes through those points (this is just basically telling you it has to be perfectly flat)


But a plane can also be any other flat surface at any angle to the x,y and z planes also, in full 360 degree rotation, and can also be triangular shaped and contained within a cuboid.

For the purposes of LC applied maths I think the x,y and z planes are all you need to know, such that the co-ordinate (x,y,z) gives you a point in 3-dimensional space and the 3 planes are at right angles to each other, like you said.

irish_boy90

in short don't worry about it