Copy of Copy of Counter-clockwise Rotation Exploration
Counter-clockwise Rotation Exploration
Drag the slider to watch triangle ABC rotate counter-clockwise.
Questions for Counter-clockwise Rotation:
1) Record the coordinates for the vertices of triangle ABC like this A ( , ) B ( , ) C ( , )
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?
3) With the triangle still rotated 90 degrees, look at the dotted lines. What type of angle do the lines form?
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.
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?
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.