A vertex (plural: vertices or vertexes) is the point of intersection of lines (like the 'corners' of a 3D shape). A corner is the same but where only two lines are intersecting.
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sides are the face of a 3d shape and verticies are the corner of the shape
A right angle.
A 3D semi circle
A cone.
2D shape = Decagon 3D shape = Decahedron