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Izidor Hafner
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Demonstrations 21  40 of 1077
Primitive Relation for Elliptic Geometry
2. Constructing a Point on a Cassini Oval
Equidistance and Betweenness in Euclidean Plane Geometry
Freese's Dissection of a Regular Hexagon into Three
Freese's Dissection of a Regular Dodecagon into Four Regular Dodecagons
Freese's Dissection of a Regular Dodecagon into Two Squares
Freese's Dissection of Two Regular Dodecagons into a Square
Freese's Dissection of a Regular Dodecagon into an Isosceles Right Triangle
31. Construct a Triangle ABC Given the Length of AB, an Adjacent Angle and the Difference of the Lengths of the Other Two Sides
Freese's Dissection of a Regular Dodecagon into a Square
Freese's Dissection of Two Regular Dodecagons into Three Squares
30. Construct a Triangle ABC Given the Length of AB, the Angle at C and the Difference of the Other Two Sides
29. Construct a Triangle ABC Given the Length of AB, the Angle at C and the Sum of the Other Sides
Pasch's Axiom in Euclidean Geometry
28. Construct a Triangle ABC Given the Length of AB, the Sum of the Other Two Sides, and a Line Containing C
1. Constructing a Point on a Cassini Oval
Point of Intersection of an Ellipse with a Line
All 11 Folding Nets of the Regular Octahedron
Parallel Tangents to an Ellipse
Equivalence of Projections in Involutive Rings
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