Interactive step-by-step animation using GeoGebra. Post your solution in the comment box below.

Level: Mathematics Education, High School, Honors Geometry, College.

Details: Click on the figure below.

## Sunday, May 24, 2020

### Dynamic Geometry 1481: Five Tangential or Circumscribed Quadrilaterals, Pitot Theorem, Congruence, Step-by-step Illustration

## Friday, May 15, 2020

### Dynamic Geometry 1480: Japanese Theorem for Cyclic Polygon, Triangulation, Non-intersecting Diagonals, Sum of Inradii, Invariant, Step-by-step Illustration

Interactive step-by-step animation using GeoGebra. Post your solution in the comment box below.

Level: Mathematics Education, High School, Honors Geometry, College.

Details: Click on the figure below.

## Saturday, May 9, 2020

### Dynamic Geometry 1479: Triangle, Circumcircle, Angle Bisector, Perpendicular Bisector, Chord, Concyclic Points, Parallel Lines, Step-by-step Illustration

Interactive step-by-step animation using GeoGebra. Post your solution in the comment box below.

Level: Mathematics Education, High School, Honors Geometry, College.

Details: Click on the figure below.

## Thursday, May 7, 2020

### Dynamic Geometry 1478: Reuschle-Terquem Theorem, Concurrent Cevians, Triangle, Circumcircle, Secant line, Cyclocevian, Step-by-step Illustration

Level: Mathematics Education, High School, Honors Geometry, College.

Details: Click on the figure below.

## Friday, May 1, 2020

### Dynamic Geometry 1477: Miquel's Pentagram Theorem, Pentagon, Triangle, Circumcircles, Concyclic Points, Step-by-step Illustration

Level: Mathematics Education, High School, Honors Geometry, College.

Details: Click on the figure below.

## Tuesday, April 28, 2020

### Dynamic Geometry 1476: Droz-Farny Line Theorem, Triangle, Orthocenter, Perpendicular, Collinear Midpoints

Level: Mathematics Education, High School, Honors Geometry, College.

Details: Click on the figure below.

## Monday, April 27, 2020

### Dynamic Geometry 1475: Clifford Intersecting Circles Theorem, Step-by-step Illustration

Level: Mathematics Education, High School, Honors Geometry, College.

Details: Click on the figure below.

## Saturday, April 25, 2020

### Dynamic Geometry 1474: Butterfly Theorem, Circle, Chords, Midpoints, Step-by-step Illustration

Level: Mathematics Education, High School, Honors Geometry, College.

Details: Click on the figure below.

## Friday, April 24, 2020

### Dynamic Geometry 1473: Kosnita's Theorem, Triangle, Four Circumcenters, Concurrent Line

Level: Mathematics Education, High School, Honors Geometry, College.

Details: Click on the figure below.

## Thursday, April 23, 2020

### Geometry Problem 1472: Cyclic Quadrilateral, Perpendicular Diagonals, Rectangle

Level: Mathematics Education, High School, Honors Geometry, College.

Details: Click on the figure below.