If the surface is small enough, the length of each edge can be taken using a ruler or tape measure. If the surface is too large, say, the side of a building, you can use trigonometry. eg: for a building, take a point a known distance from the building's base and measure the angle from that point to the top. the building's height is
tan(angle) x distance from base
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A plane is a flat surface with only two dimensions. No real planes are found in space, because all matter has 3 dimensions.
An isometric triangle is a 3 dimensional triangle shown on a flat surface or in 2 dimensions.
on a 3D object to find the surface is to look on all flat surfaces. yourwelcome
It does not have a flat surface.
A flat surface, like a sheet of paper, with no edges (ie: it goes on and on and on and on....) or boundaries. What you're describing is a 2 dimensional plane. No, not plane like an airplane. A plane is simply a flat "sheet" that goes on forever in 2 dimensions: left/right (wide) and up/down (tall).