[b]Counter-clockwise Rotation Exploration[/b][br][br]Drag the slider to watch triangle ABC rotate counter-clockwise.

Questions for Counter-clockwise Rotation:[br][br]1) Record the coordinates for the vertices of triangle ABC like this A ( , ) B ( , ) C ( , )[br][br]2) Rotate triangle ABC 90 degrees counter-clockwise. Record the new coordinates for the 3 vertices. What happened to the x and y coordinates? What happened to their signs?[br][br]3) With the triangle still rotated 90 degrees, look at the dotted lines. What type of angle do the lines form?[br][br]4) Rotate the original triangle ABC 180 degrees counter-clockwise. Record the new coordinates for the 3 vertices. Compare the coordinates to the original coordinates of triangle ABC. Describe how the coordinates changed.[br][br]5) With the triangle still rotated 180 degrees, look at the dotted line that connects the two triangles. Is there an angle? How many degrees? What is its shape?[br][br]6) Rotate the original triangle ABC 270 degrees counter-clockwise. Record the new coordinates for the 3 vertices. Compare the coordinates to the original coordinates of triangle ABC. Describe how the coordinates changed.