


Online Geometry: Congruence, Rotation, Translation, Reflection  Page 1




Euclid's Elements
Book I, 23 Definitions. Onepage visual illustration.
Euclid's Elements Book.
Index 

Perpendicular
Bisector. 

Kaleidoscope Index.


Reflection, Theorems and
Problems. 

Euclid's Elements Book I, Proposition 4: (SideAngleSide SAS) 

Geoboard
for iPad Pythagorean Theorem Proof by Leonardo. 

Geoboard
for iPad Pythagorean Theorem Proof, Squares (Problem 540). 

Geoboard
for iPad Gallery: Triangle with two squares (Problem 496). 

Semiperimeter and excircles of a triangle.


Semiperimeter and incircle of a triangle. 

Semiperimeter, incircle and excircles of a triangle.


Parallelogram with Squares theorem Thébault's Theorem.


Johnson's Theorem,
Intersecting circles.
HTML5 Animation 

Varignon and Wittenbauer parallelograms. Quadrilateral: midpoints and
trisection points of the edges.


Van Aubel's Theorem.
Quadrilateral with Squares. Proof with animation.


Langley's Problem
Adventitious angles. 20° isosceles triangle with animation.


Geometry Problem 1329.
Two Squares Side by Side, Parallel, Perpendicular, 90 Degrees, Congruence. 

Geometry Problem 1328.
Two Squares Side by Side, Perpendicular, 90 Degrees, Congruence. 

Geometry Problem 1317.
Triangle, Excircle, Chord, Tangent, Midpoint, Arc, Sum of two Segments, Congruence. 

Geometry Problem 1316.
Triangle, Incircle, Tangent, Chord, Midpoint, Sum of two Segments, Congruence. 

Geometry Problem 1315.
Triangle, Incircle, Tangent, Chord, Circle, Congruence. 

Geometry Problem 1314.
Equilateral Triangle, Incircle, Inscribed Circle, Tangent, Congruence. 

Geometry Problem 1313.
Regular Decagon, Pentadecagon, Equilateral Triangle, Congruence. 

Geometry Problem 1304.
Triangle, 120 Degrees, Angle Bisector, Measurement. 

Geometry Problem 1303.
Triangle, 60 Degrees, Angle Bisector, Measurement. 

Geometry Problem 1302.
Triangle, Median, Midpoint, Circles, Diameters, Congruence. 

Geometry Problem 1295.
Right Triangle, Incenter, Incircle, Excenter, Excircle, Congruence, Angle. 

Geometry Problem 1293.
Triangle, Altitudes, Two Squares, Center, Concurrent Lines, Midpoint. 

Geometry Problem 1291.
Three Squares, Collinear Vertices, Midpoint, Congruence. 

Geometry Problem 1287.
Triangle, 4010040 Degrees, Congruence, Area, Metric Relations, Measurement. 

Geometry Problem 1286.
Triangle, Quadrilateral, 60, 135, 105 Degree Angles, Congruence, Measurement. 

Geometry Problem 1285.
Triangle, Quadrilateral, 60, 150, 90 Degree Angles, Congruence, Measurement. 

Geometry Problem 1284.
Two Equilateral Triangle, Midpoint, Congruence. 

Geometry Problem 1278.
Square, 345 Right Triangle, Midpoint. 

Geometry Problem 1272.
Isosceles Triangle, Median, Midpoint, Perpendicular, 90 Degrees, Angles, Congruence. 

Geometry Problem 1250.
Cyclic or Inscribed Quadrilateral, Circle, Diameter, Congruence. 

Geometry Problem 1238
Square, Equilateral Triangle, Metric Relations. Mobile Apps. 

Geometry Problem 1237
IMO 2016, Problem 1, Triangle, Congruence, Parallel Lines, Midpoint, Concurrency. 

Geometry Problem 1234
Quadrilateral, 60 Degrees, Midpoint, Congruence, Cyclic Quadrilateral, Concyclic Points. 

Geometry Problem 1230
Quadrilateral, 60 Degrees, Congruence, Metric Relations. 

Geometry Problem 1226
Quadrilateral, Squares, Centers, Midpoints, Congruence. 

Geometry Problem 1225
Equilateral Triangle, Circumcircle, Angle Bisector, Congruence. 

Geometry Problem 1222
Doubling the Cube, Triangle, 90, 120 degrees, Perpendicular, Congruence. 

Geometry Problem 1220
Equilateral Triangles, Midpoints, 60 Degrees, Congruence. 

Geometry Problem 1219
Equilateral Triangles, Midpoints, 60 Degrees, Congruence, Rhombus. 

Geometry Problem 1218
Scalene Triangle, Equilateral Triangles, Midpoints, 60 Degrees, Congruence. 

Geometry Problem 1213
Triangle, Circumcircle, Altitudes, Cyclic Quadrilateral, Congruence. 

Geometry Problem 1209
Triangle, Circle, Excircle, Excenter, Circumcircle, Congruence. 

Geometry Problem 1207
Triangle, Circle, Incenter, Circumcenter, Excenter, Circumradius, Perpendicular, 90 Degrees. 

Geometry Problem 1206
Circle, Angle Bisector, Secant, Triangle, Circumcircle, Congruence, Area. 

Geometry Problem 1203
Right Triangle, Square, Angle Bisector, Three Congruent Quadrilaterals. 

Geometry Problem 1202
Four Squares, Two Equal Parallelograms, Congruence. 

Geometry Problem 1195
Square, Two Rectangles, Congruence, Metric Relations. 
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Home  Geometry
 Congruence  Email  by Antonio
Gutierrez
Last updated: Apr 10, 2017






