Parallel line through a point
1. Construct the parallel line through the point. 2. Save as "Parallel line", download as a ggb file and turn in to dropbox.
Incircle and circumcircle with growing bubbles.
Midsegments of triangles and trapezoids
Planificação de prismas retos
Pythagoras Proof Without Words
Presley's Exterior Angles
Star, Six Pentagons and the Golden Ratio
collinear and non collinear points