Dr. Geo free

In this free version, the following features are not activated: parallel and perpendicular lines, circle and save a sketch. Purchase the complete version to get it activated.

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.

Plus many more to explore or to create yourself.

All in all Dr. Geo is an interactive geometry application. It allows one to

create a geometric model you can manipulate according to its

constraints. It is usable at home or at school, in primary or

secondary education level. With the free Desktop version, you can also

construct very elaborated sketches to share with your friends,

students or kids on tablet.

With Dr. Geo you construct:

- 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.