DrGeoII

DR GEO II

//Dr. Geo allows one to create geometric figure plus the interactive manipulation of such figure in respect with their geometric constraints// You can download Dr Geo at home for any OS (Mac, Linux, Windows) and play with it: http://download.gna.org/istoa/drgeo/ Looking at the samples on this download is a good starting point

QUESTIONS: Is there anyway to clean a DrGeo screen with a single command? (other >erase is painstakingly slow, one item at a time) How do you undo in DrGeo? Answer: other > undo

VIDEOS, available from [|Screencast DrGeo]: (teacher will make these available)

CONFIGURING WORKSPACE 002-record-in-menu.ogg How to extract individual items from the Dr Geo menu, eg. if you are just working with curves extract that 022-persiting-contextual-menu.ogg How to make the Dr Geo tools menu persist, to embed it in the Dr Geo window and to modify its layout (but the layout feature is not available on my xo) 031-using-buttons.ogg How to put buttons on the screen for menu items, eg. have a button for points, etc
 * Task**: Make Dr Geo tools menu persist and embed it in the DrGeo window (morphic menu > embed, then test by moving the DrGeo window)

POINT TOOLS 100-free-point.ogg How to create a line segment with a point on it that can move along the line 102-point-by-coordinate.ogg numerics > distance, length, value > put numbers on the Dr Geo workspace and then use those numbers to create a point at those co-ordinates 103-middle-2points.ogg How to place a point in the middle of two other points 104-middle-segment.ogg Place a point in the middle of a line segment

CURVE TOOLS 204-circle-center-radius.ogg
 * Task**: Mark a point, get a number (numerics>distance, length, value), then make that the circle radius

205-polygon.ogg To finish the polygon you should click on **the original point** a second time, after its balloon help pops up 205-locus.ogg Creates a locus point See http://www.cut-the-knot.org/Curriculum/Geometry/LocusCircle.shtml for explanation of locus point
 * Task**: Make an arrow head

TRANSFORMATIONS

302-axial-symmetry.ogg
 * Task**: Create an arrow head, add a line, then complete the axial symmetry transformation. Move the line and observe changes.

302-central-symmetry.ogg
 * Task**: Create an arrow head, add a point, then complete the central symmetry transformation. Move the point and observe changes.

303-translation.ogg
 * Task**: Create an arrow head, add a vector, then complete the translation

304-rotation-radian.ogg
 * Task**: Create an arrow head, then put a point on the screen, then put a number on the screen, then complete a transformation > rotation around the point (click point, polygon, number in that order). Move the point and observe rotation. Edit the number and do again. (NB: the edit the number process: other > style then click on number, the edit value)

305-rotation-geometric-angle-degree.ogg
 * Task**: Create an angle and then dynamically vary the angle - nice! Rotate a polygon around a point and then vary the angle of rotation. This one is a lot of fun!

307-scale.ogg
 * Task**: Create an arrow head, put a point, then a number on the screen, choose transformations > scale, move the point and observe. Edit the number, try both positive and negative numbers

NUMERICS 400-numeric-distance.ogg Measure the distance between 2 points, move one of the points and observe the distance change Measure the radius of a circle

401-numeric-geometric-angle.ogg Make an angle, measure it and change it dynamically

402-numeric-oriented-angle.ogg Same as 401 but using vectors

403-numeric-free-value.ogg How to put a number on the screen and edit its value

OTHER 501-tools-eraser.ogg other > erase then click on the object you want to erase