 The second interlude is set out to be worked on one centimeter graph paper But you might wish to work with geogibber in with this activity, so if you open geogibber you get a screen like this We don't want algebra. We don't want all the points to be shown with letters and the Equations of the lines then so the first thing is to close the algebra window put your pointer up on that little cross and close the algebra window Once you have done that it will be useful to get the grid on So left click on the grid at the top of the screen and then let's remove the axes So click on that one The next thing I want to do is organize the labeling at the moment every new point will have a letter a Bcd in order if I press no new objects, then I will not get labels. I Want to start by making a polygon? So let's make a simple square of area 4 And we do that and as soon as we get back to the beginning then It closes the polygon or four-sided in this case go for the arrow Left click on that polygon and it says the the quadrilateral polygon a Bcd Go for the object properties and I can color that one in We might make that one right green Make that one bright green, but I need it much stronger. So fill it into a hundred percent and Go back Off that and see what's happened. So my first four centimeter Shape is there if I go now to a polygon. I can add the next one onto it And I might be possible to make a simple L shape We need a one plus three and there is the L shape go back to the arrow And I can left click on that one and this is polygon E F G H CB object properties the object properties we can make that one red and Make it pretty Dense now all the points are shown at the moment on the corners But if you click on that one That disappears so we can make all these points disappear just by clicking on them and You can see them disappear as I do it and that has removed all the points If I want one of them back at any time I can do that and it appears So we go off the object properties and we have now got two of the four Centimeter for square centimeter shapes if I want to do another one, I might be interested in Using a triangle has been half a Rectangle so if we make a rectangle on on here Which is one two four by two That rectangle is area eight Now I could have that rectangle For instance by putting in this Triangle and that triangle in there is now of Area four base is to the height along there is four Two times four is eight and half If I click on that triangle That polygon object properties I can make that triangle of Purple it's like that. I have done the wrong one. I need that one to be Very faint and somewhere. I made a triangle. Ah polyphore That one there. I'll make that one different color a pale blue And make that very dense So what we now have is that triangle inside the rectangle But if we go back to the rectangle, I Can go for basic and Not show the object If I do that that one has disappeared And of course I want to get rid of some of these points getting rid of that Which is possible now To look at that as the next one but clicking again on there Obvious properties I Might want to look at That last point there M Get rid of that Now I can move that point there Up to there and all those all those that triangle Will have the same area. I hope that might be enough to start you off