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The Lucas central circle is the circumcircle of the Lucas central triangle. The center, radius, and circle function appear to be complicated, and neither the center nor the ...

The MacBeath circle, a term coined here for the first time, is the circumcircle of the MacBeath triangle. It has a fairly complicated radius, center function, and circle ...

The MacBeath triangle DeltaX_AX_BX_C (a term coined here for the first time), is the triangle whose vertices are the contact points of the MacBeath inconic with the reference ...

A major arc (right figure) is an arc of a circle having measure greater than or equal to 180 degrees (pi radians).

Every point which can be constructed with a straightedge and compass, and no other points, can be constructed using identical matchsticks (i.e., identical movable line ...

The dual of the rhombidodecadodecahedron U_(38) and Wenninger dual W_(76).

The 30-faced dual of the truncated dodecadodecahedron and Wenninger dual W_(98).

The dual of the snub icosidodecadodecahedron U_(44) and Wenninger dual W_(112).

The dual of the icosidodecadodecahedron and Wenninger dual W_(83).

The dual of the inverted snub dodecadodecahedron U_(60) and Wenninger dual W_(114).