in plane survey the surface of earth assume as plane or straight its uses as limited distance where as in geodetic survey surface of earth assume as curve its use in long distance.
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flying air.
Rotary Engines
bedding plane
They are physical characteristics of a plane shape. 3-dimensional shapes do have areas, but the concept of a perimeter is generally restricted to plane shapes.
A bird is an animal with feathers. A plane is a constructed object.