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a surface that does not move
A 2D interior will be length times width (a flat shape) as in the area of a floor.A 3D figure would be length times width times depth (a raised shape) as in a box.The units used would depend. A floor would be in feet and inches or metres and centimetres.A 3D figure would be in a similar measurement, but given in cubic units.
An Hemisphere or a Cone.
Its base is a flat surface
A mirror with a flat surface - planar
a surface that does not move
an inclined plane
what is the name of an flat surthis
A raised panel door has a rim, then an indentation and the panel inside it is raised to the level of the rim. A flat panel door is more like a picture frame where the rim is raised and the panel inside it is indented.
That sounds like a ramp to me.
A cone would fit the given description
A 2D interior will be length times width (a flat shape) as in the area of a floor.A 3D figure would be length times width times depth (a raised shape) as in a box.The units used would depend. A floor would be in feet and inches or metres and centimetres.A 3D figure would be in a similar measurement, but given in cubic units.
craters
I think you mean a plateau. Plateau: expanse of raised land with a level surface. Also known as tableland, do to the flat tops.
Slip-On Flat Face Flange. It means the face of the flange, the surface the physically touches the next flange is flat as opposed to raised (SORF Flange)
A plateau is a large, flat area commonly found in the interior of continents. Plateaus are typically elevated landforms with a relatively flat, level surface that rise above the surrounding terrain. They are formed by geological processes such as faulting, volcanic activity, or erosion.
Topography refers to the surface features of a place or region.