A plane is a straight line. An angls is formed by 2 intersecting lines.
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it is same as surface and volume ! a plane angle is 2D and solid angle is 3D
In a first angle projection, the object stands in between the observer and the plane of projection. In a third angle project, the object and the plane of projection is interchanged.
A horizontal angle is an angle between lines on a horizontal plane.
The difference is 270 degrees.
there is no difference