Dr. Geo 12.10 for iPad is available on AppStore. It comes in two versions: gratis and paid. Be a geometer with Dr. Geo: construct and manipulate interactive geometric models. Learn geometry (and physics, too!) visually and interactively. - Construct quadrilaterals and explore the properties of the parallelogram, rectangle, rhombus or square.
- Draw a triangle and its circumscribing circle, then drag one of its corners slowly to cross the opposite side. Visually observe why a straight line is an "infinite circle". Get junior high school kids motivated with the idea of "crosscap" in projective geometry and topology.
- Learn about the symmetry you can find in car logos.
- Understand why the measures of the interior angles of a triangle always add up to 180 degrees.
- Visualize the properties of the rectangle, isosceles or equilateral triangles.
- Understand how a Newtonian telescope works and play with its model.
- Play with the Trammel of Archimedes to draw ellipse.
- Draw an ellipse, then drag one of its focii, and watch how it gradually becomes a hyperbola.
- Move the focus of a lens in a Dr. Geo sketch, and learn how a real inverted image morphs into a virtual upright image. Use the macro function to stack two lens and create your microscope in Dr. Geo.
- Discover how Eratosthenes calculated the circumference of the Earth.
- free point, mobile point on a curve, intersection point, point at the middle of two points, or segment middle.
- line, parallel line, perpendicular line, perpendicular bisector, angle bisector, ray, segment, vector, circle, arc, polygon, locus.
- geometric transformation: symmetry, reflection, translation, homothety (scale).
- distance between objects, length, coordinates, equations, free text.
- macro-construction: teach Dr. Geo how to construct complex objects for you.
When constructing an object, Dr. Geo deduces from your construction sequence the exact nature of the object you want to construct. - select two points then Dr. Geo constructs a circle defined by its center and a point it goes through.
- select one point and a segment then Dr. Geo constructs a circle defined by its center and a radius equal to the segment's length.
- select one point and a value then Dr. Geo constructs a circle defined by its center and a radius equal to the value.
When necessary, Dr. Geo constructs for you, on the fly, intermediate point(s): free on the sketch, mobile on a curve or at the intersection of two curves. Feedbacks are welcome and greatly appreciated!Dr. Hilaire Fernandes |

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