(:title Getting Started with GeoGebra:) >>-<< Sorry - this is not an InterActivity yet and shouldn't be here ... but it is coming. >>-<< [table border=1 cellpadding=3 width=98%] [row] [] %sol c11%A little screencast to get you going ...%% (:div style="margin-left:20px":) >>&<< %popwin width=820 height=560 %[[http://mathcasts.org/gg/geogebra_starter/geogebra_starter.html|Attach:InterA/geogebra_starter.jpg]] >>&<< (:divend:) [row] [][[http://math247.pbwiki.com/Learn+and+Use+GeoGebra|%c12 pra%Online tutorials: screencasts plus written directions%%]] [tableend] >>&<< [table border=1 cellpadding=3 width=98%] [row] [] >>&<< (:showhide init=show div=div2 lshow="+" lhide="-":) %exa c11%Interactivity%% - Construct a parallelogram ABCD with vertices A, B and C (:div222 style="margin-left:20px":) >>&<<%sol s8%(:showhide init=hide div=div22 lshow="+" lhide="-":) Directions for interactivity%% (:div2 id=div2 :) >>&<< (:div22 id=div22 style="margin-left:20px" class="sol s9":) >>&<< %mor%In the top right:%% Reset button Attach:GgbActivity./reset.jpg to start over '''or''' Undo button Attach:GgbActivity./undo.jpg to undo last step. >>&<< %exa%First draw sides {$\overline{AB}$} and {$\overline{BC}$}%% (:showhide init=hide div=div12 lshow="+" lhide="-":) How? (:div12 id=div12 style="margin-left:20pts" :) *Select the line segment tool Attach:GgbActivity./segment.jpg and click on A and then on B (they will glow). **You will get a line segment a joining A and B. * Click on B and then on C. **You will get a line segment b joining B and C. (:div12end :) >>&<< %reg%Now pick any of the 3 ways below to draw a parallelogram. You will always get the point D(-3,4)!%% >>&<< %pra%'''One way''' to draw the parallelogram (based on definition that opposite sides are parallel).%% (:showhide init=hide div=div13 lshow="+" lhide="-":) How? (:div13 id=div13 style="margin-left:20pts":) *Select the parallel line tool Attach:GgbActivity./parallel.jpg and click on point A and then on line b. **You will get a line c passing through A and parallel to {$b=\overline{BC}$}. *Click on point C and then on line a. **You will get a line d passing through C and parallel to {$a=\overline{AB}$}. *Click on the intersection tool Attach:GgbActivity./intersect.jpg and then click on the intersection point of c and d. **You will get the point D at (-3,4). (:div13end :) >>&<< %pra%'''Another way''' to draw the parallelogram (based on definition that opposite sides are the same length).%% (:showhide init=hide div=div14 lshow="+" lhide="-":) How? (:div14 id=div14 style="margin-left:20pts":) *Select the compass tool Attach:GgbActivity./compass.jpg and click on center point A and then on B and on C. **You will get a circle c with center A and radius the length of {$b=\overline{BC}$}. *Click on point C and then on A and on B **You will get a circle d with center C and radius the length of {$a=\overline{AB}$}. *Click on the intersection tool Attach:GgbActivity./intersect.jpg and then click on the intersection point of c and d. **You will get the point D at (-3,4). (:div14end :) >>-<< %pra%'''A third way''' to draw the parallelogram (based on definition that the diagonals bisect each other).%% (:showhide init=hide div=div15 lshow="+" lhide="-":) How? (:div15 id=div15 style="margin-left:20pts":) *(With the line segment tool still selected, draw the diagonal {$c=\overline{AC}$}. *Select the midpoint tool Attach:GgbActivity./midpt.jpg and click on c. **You will get the midpoint D of {$b=\overline{AC}$}. Right-click on the label "D", select rename and type in E and click on OK. *Click on the line tool Attach:GgbActivity./line.jpg and click on B and then on E to get the line d. *Click on the circle-center-point tool Attach:GgbActivity./circle_2pt.jpg and then click on E and then on B. **You will get a circle e with center E and radius the length of {$a=\overline{EB}$}. (It will pass through B.) *Click on the intersection tool Attach:GgbActivity./intersect.jpg and then click on the intersection point of line d and circle e. **You will get the point D at (-3,4). (:div15end :) >>-<< (:div22end:) >>&<< (:applet name="ggbApplet" code="geogebra.GeoGebraApplet" codebase="Java/GeoGebra/" archive="http://www.geogebra.org/webstart/geogebra.jar" width="800" height="450" filename="http://mathcasts.org/mtwiki/uploads/InterA/GgbStarterT.ggb" language="en" showResetIcon="true" showToolBar="true" showMenuBar="true":) (:div2end :) (:div222end:) >>-<< [row] [] >>&<<%sol s8%(:showhide init=hide div=div3 lshow="+" lhide="-":) How to save interactivity%% (:div3 id=div3 style="margin-left:40px":) *To save and then use the saved file, you will need to download and install [[http://www.geogebra.org|GeoGebra]] *If there is a menubar, click on File -> Save. *If there is no menubar, double-click anywhere in the interactivity. A separate GeoGebra window will open (with menubar). Click on File -> Save. >>&<< [tableend] >>-<< ---- (:showhide3 init=hide div=box4 lshow='Add Comment' lhide='Close':) >>id=box4<< (:commentbox:) >><< [table width=100% border=0] [row] [][[interA/| Attach:main/tri_purple_up_a.gif ]] [[interA/| Up one level]] [r](:html:) (:htmlend:) [tableend]