Learning Geometry with the GeoGebra Platform

Topic:Angles, Area, Centroid or Barycenter, Circle, Circumcircle or Circumscribed Circle, Congruence, Constructions, Equilateral Triangles, General Quadrilateral, Geometry, Incircle or Inscribed Circle, Isosceles Triangles, Straight Lines, Mathematics, Median Line, Orthocenter, Parallelogram, Perimeter, Plane Figures or Shapes, Planes, Polygons, Pythagoras or Pythagorean Theorem, Quadrilaterals, Rectangle, Rhombus, Right Triangles, Scalene Triangles, Similar Triangles, Special Points, Square, Tangent Line or Tangent, Trapezoid, Triangles