Move the rotation slider back to 0[math]^\circ[/math]. Move the point of rotation to (4,2), or in other words, move the x slider to 4 and the y slider to 2. Next, draw a circle using the circle with center through point [icon]/images/ggb/toolbar/mode_circle2.png[/icon] tool. First click the point of rotation (the red point at (4,2)), then click on point A on the preimage (the brown one). Don't forget to change back to the select[icon]/images/ggb/toolbar/mode_move.png[/icon] tool before moving the slider.
Now rotate the shape so that point B is at the origin. What angle did you rotate by?
You should have rotated the figure by 90[math]^\circ[/math]. If not, go back and do it now.
Now rotate the shape so that point C is at (4,0). What angle did you rotate by?
You should have rotated it by 180[math]^\circ[/math]. If not, go back and do it now.
[i]Check your answers, redo any exercises you missed, then move on to [url=https://www.geogebra.org/book/title/id/2660003#material/2667027]Exploring Rotation 3[/url].[/i]