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Circular Ring Sector.
.000025 circular inches = 25 circular mils
A right circular cone is perfectly balanced on its circular base. Imagine a cone that has a circular base, but leans to one side - this is a non right circular cone.
An inverse is NOT called a circular function. Only inverse functions that are circular functions are called circular functions for obvious reasons.
In a right circular cone a line from the vertex to the center of the circular base is perpendicular to the base. In an oblique circular cone that same line will not be perpendicular.