It is an edge.
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If its 2d its called a semi-circle, if its 3d its called a semi-sphere.
Surface area is all the areas for a 3 figure. Area is for only on side of a 3d figure
An edge is an area of a 3D figure where two faces meet to form a line segment.
Sometimes because a sphere which is a 3d figure has a diameter
A 2D seven sided figure is called a heptagon. A 3D seven faced polygon is called a heptahedron.