it is same as surface and volume ! a plane angle is 2D and solid angle is 3D
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A solid angle, measured from a vertex, is the ratio between the area subtended by the angle at the vertex and the the square of the distance to the vertex. The unit of measurement is the stradian.
there is no difference because a solid shape is a solid because its solid as if in hard so there is no difference. if you want you can still look it up on google or something. !
the difference between a two dimensional shape and and a solid is that a two dimensional shape is plane and a solid you can see the whole shape a the inside.
Their dimensionality.
Angle of contact is the angle between a tangent to the liquid surface at the interface and the solid surface inside the liquid. For concave surfaces, it is acute . For convex surface , it is obtuse.