


Geometry Problem 1398.
Isosceles Triangle, Circle, Radius, Perpendicular, Measurement. 

Geometry Art: Gecko Art Index. 

Geometry Problem 1397. Circle, Diameter, Tangent, Secant, 90 Degrees Angle,
Perpendicular, Collinear Points. 

Geometry Problem 1396. Triangle with three rectangles on the sides, Vertices, Perpendicular lines, Concurrency. 

Geometry Problem 1395. Triangle with three rectangles on the sides, Midpoints, Perpendicular lines, Concurrency. 

Geometry Problem 1394. Three Circles and Three Pair of Common Internal Tangents, Concurrency. 

Geometric Art: Celtic Maze,
Kaleidoscope, Deform around Spiral 

Geometry Problem 1393. Monge's Circle Theorem, Three Circles and Three Pair of Common Tangents, Collinearity. 

Geometry Problem 1392. Two Cyclic Quadrilateral, Cyclic Octagon, Circle. 

Geometry Art: Celtic Art Index. 

Geometry Problem 1391. Two Triangles, Ratio of Areas, Circumcircle. 

Geometry Problem 1390. Triangle, any point, perpendicular, sum of the squares. 

Art of Geometry Problem
603. Generative Art Composition. 

Geometry Problem 1389. Triangle, 4012020 degree, Angle, Congruence. 

Poster of Geometry Problem 1389. 

Isolines Art Illustration of the Nazca Lines: The Parrot.


Geometry Problem 1388. Triangle 406080 degree, Incenter, Congruence. 

Conformal Mapping or Transformation of Problem 291. 

Etching and Typography of Geometry Problem 652.
Archimedes Book of Lemmas: Proposition 12
Using iPad Apps. 

Geometry Problem 1387. Quadrilateral, Double Angle, Congruence, Isosceles Triangle. 

Word Cloud of Pythagorean Theorem


Geometry Problem 1386. Thabit ibn Qurra (826 901) Theorem and more conclusions, generalized Pythagorean Theorem to any triangle. 

Conformal Mapping or Transformation of Problem
1386. 

Geometry Problem 1385. Triangle, Orthocenter, Circle, Circumcircle, Angle Bisector, Midpoint, Collinear Points. 

Poster
of problem 80. Area of a
triangle, side, incircle, inradius. 

Geometry Problem 1384. Triangle, Orthocenter, Circle, Circumcircle, Angle Bisector, 90 Degree. 

Art of Problem 1384.
Triangle, Orthocenter, Circle, Angle Bisector, Perpendicular, iPad Apps, Mobile. 

Geometry Problem 1383. Triangle, Median, Circle, Chord, Secant, Sum, Product. 

Geometry Problem 1382. Circle, Diameter, Radius, Perpendicular, Congruence. 

Conformal Mapping or Transformation of Problem
1382. 

Geometry Problem 1381. Parallelogram, Exterior Point, Triangle, Area. 

Geometry Problem 1379. Common External Tangents. Circles, Secant, Congruent Chords. 

Conformal Mapping or Transformation of
Geometry Problem
1381. 

Poster of Geometry Problem 1381. 

Geometry Problem 1380. Common
Internal Tangents. Circles, Secant, Congruent Chords. 

Poster of Problem 1380. 

Geometric
Art of Problem 985. 

Cahuachi,
Major Nazca Ceremonial Center. 

Geometry Problem 1378. Parallelogram, Diagonal perpendicular to a side, Distances from a Point to Vertices, Measurement. 

Art of Problem 291. 

Geometry Problem 1377. Isosceles Triangle, Interior Cevian, Equal Sum of Exradii, Excircle. 

Poster of Geometry Problem 63 

Geometry Problem 1376. Isosceles Triangle, Interior Cevian, Excircles, Tangency Points, Parallel Lines. 

Geometry Problem 1375. Isosceles Triangle, Interior Cevian, Exradius, Excircle, Altitude to the Base. 

Typography
art of Problem 1375. 

Geometric
Art: Etching of Machu Picchu using iPad Apps 

Etching and Typography of Geometry Problem 640.
Archimedes Book of Lemmas: Proposition 1
Using iPad Apps. 

Geometry Problem 1374. Isosceles Triangle, Exterior Cevian, Incircle, Excircle, Tangency Points, Parallel Lines. 

Typography
art of Problem 1374. 

Geometry Problem 1373. Isosceles Triangle, Exterior Cevian, Inradius, Exradius, Altitude to the Base. 

Typography
art of Problem 1373. 

Geometry Problem 1372. Equilateral Triangle, Exterior Cevian, Inradius, Exradius, Altitude, Sketch, iPad Apps. 

Cevian Definition.


Einstein and
the Pythagorean theorem proof .
About his "holy geometry book" (Euclid's Elements) Similarity of
triangles.


Geometry Problem 1371: Equilic
Quadrilateral 5 

Etching and Typography of Geometry Problem 1367: Equilic
Quadrilateral using iPad Apps. 

Typography of Geometry Problem
812. 

Geometry Problems
1361  1370. 

Geometry Problem 1370: Equilic
Quadrilateral 4 

Geometry Problem 1369: Equilic
Quadrilateral 3 

Geometry Problem 1368: Equilic
Quadrilateral 2 

Geometry Problem 1367: Equilic
Quadrilateral 1 

Geometry Problem 1366.
Square, Angle Bisector, Perpendicular, Concyclic Points, Circle, Sketch, iPad Apps. 

Typography of Problem 491. 

Geometric Art Problems
3140. 
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