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Euclid's Elements, Book I  El...

Spherical geometry (Geometry) 
Java Applet 
Tool 

[0]

Notes on elliptic geometry and its properties, as an alternative to Euclidean geometry. To reset the applet, press "r" while your cursor is over the diagram.
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Euclid's Elements, Book I  Hy...

Hyperbolic geometry (Geometry) 
Java Applet 
Tool 

[0]

Notes on hyperbolic geometry and its properties, as an alternative to Euclidean geometry. To reset the applet, press "r" while your cursor is over the diagram.
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Euclid's Elements, Book I, Def...

Line (Geometry) 
Java Applet 
Tool 

[0]

Gives Euclid's original definition of a line and then examines the definition's validity and durability. To reset the applet, press "r" while your cursor is over the diagram.
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Euclid's Elements, Book I, Def...

Angles (Geometry) 
Java Applet 
Tool 

[0]

Gives Euclid's original definition of a plane angle and then examines the definition's validity and durability. To reset the applet, press "r" while your cursor is over the diagram.
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Euclid's Elements, Book I, Def...

Angles (Geometry) 
Java Applet 
Tool 

[0]

Gives Euclid's original definition of a rectilinear angle and then examines the definition's validity and durability. To reset the applet, press "r" while your cursor is over the diagram.
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Euclid's Elements, Book I, Def...

Perpendicular (Geometry) 
Java Applet 
Tool 

[0]

Gives Euclid's original definition of perpendicular lines and then examines the definition's validity and durability. To reset the applet, press "r" while your cursor is over the diagram.
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Euclid's Elements, Book I, Def...

Obtuse (Geometry)+ 
Java Applet 
Tool 

[1]

Gives Euclid's original definitions of obtuse and acute angles and then examines the definitions' validity and durability. To reset the applet, press "r" while your cursor is over the diagram.
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Euclid's Elements, Book I, Def...

Circles (Geometry)+ 
Java Applet 
Tool 

[0]

Gives Euclid's original definitions of a circle, center, diameter, and semicircle and then examines the definitions' validity and durability. To reset the applet, press "r" while your cursor is over ...
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Euclid's Elements, Book I, Def...

Triangles (Geometry)+ 
Java Applet 
Tool 

[0]

Gives Euclid's original definition of a rectilinear figure and then examines the definition's validity and durability. To reset the applet, press "r" while your cursor is over the diagram.
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Euclid's Elements, Book I, Def...

Isosceles (Geometry)+ 
Java Applet 
Tool 

[0]

Gives Euclid's original definitions of an equilateral, isosceles, scalene, rightangled, obtuseangled, and acuteangled triangle and then examines the definitions' validity and durability. To reset t...
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Euclid's Elements, Book I, Def...

Quadrilaterals (Geometry) 
Java Applet 
Tool 

[0]

Gives Euclid's original definitions of a square, oblong, rhombus, rhomboid, and trapezia and then examines the definitions' validity and durability. To reset the applet, press "r" while your cursor i...
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Euclid's Elements, Book I, Def...

Parallel (Geometry) 
Java Applet 
Tool 

[0]

Gives Euclid's original definition of parallel lines and then examines the definition's validity and durability. To reset the applet, press "r" while your cursor is over the diagram.
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Euclid's Elements, Book I, Pos...

Line (Geometry) 
Java Applet 
Tool 

[0]

Presents Euclid's postulate for drawing a straight line and examines its precision. To reset the applet, press "r" while your cursor is over the diagram.
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Euclid's Elements, Book I, Pos...

Line (Geometry) 
Java Applet 
Tool 

[0]

Presents Euclid's postulate on a finite straight line within a continuously straight line and examines its precision. To reset the applet, press "r" while your cursor is over the diagram.
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Euclid's Elements, Book I, Pos...

Radius (Geometry) 
Java Applet 
Tool 

[0]

Presents Euclid's postulate on defining any circle based on its center and radius and examines its precision. To reset the applet, press "r" while your cursor is over the diagram.
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Euclid's Elements, Book I, Pos...

Right (Geometry) 
Java Applet 
Tool 

[0]

Presents Euclid's postulate that all right angles and equal and examines its precision. To reset the applet, press "r" while your cursor is over the diagram.
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Euclid's Elements, Book I, Pos...

Parallel (Geometry)+ 
Java Applet 
Tool 

[0]

Presents Euclid's postulate the angles formed when a transversal line intersects two other given lines and examines its precision. To reset the applet, press "r" while your cursor is over the diagram...
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Euclid's Elements, Book I, Pro...

Isosceles (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition deals with the construction of an equilateral triangle. The guide then examines the structure of the proposition. To reset the applet, press "r" while your cursor is over the di...
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Euclid's Elements, Book I, Pro...

Line (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition deals with constructing a straight line equal to a given straight line with one end at a given point. The guide then examines the structure of the proposition. To reset the appl...
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Euclid's Elements, Book I, Pro...

Line (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition deals with cutting off from the greater of two unequal straight lines a straight line equal to the lesser line. The guide then examines the structure of the proposition. To reset...
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Euclid's Elements, Book I, Pro...

Congruence (Geometry) 
Java Applet 
Tool 

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Euclid's proposition deals with the congruence of two triangles if they two sides equal that contain one equal angle respectively then all other angles and sides of the two triangles are equal and the...
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Euclid's Elements, Book I, Pro...

Isosceles (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows that the angle measure of the two base angles of an isosceles triangle remains the same when the two sides (other than the base) are extended equally. The guide then examin...
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Euclid's Elements, Book I, Pro...

Isosceles (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows that when two angles in a triangle are equal, then the sides opposite the angles are equal. The guide then examines the structure of the proposition. To reset the applet, ...
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Euclid's Elements, Book I, Pro...

Congruence (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows that it is impossible for two different triangles to exist that have equal sides and share the same base (SideSideSide Congruence, SSS). The guide then examines the struc...
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Euclid's Elements, Book I, Pro...

Equilateral (Geometry)+ 
Java Applet 
Tool 

[0]

Euclid's proposition shows that when corresponding sides of two triangles are equal then their respective corresponding angles are also equal. The guide then examines the structure of the proposition...
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