# Exploring a Rotation about the Origin

Observe how the triangle changes location as you manipulate the slider to change to angle of rotation.

1. Is this rotation going clockwise or counterclockwise?
2. Record the coordinates for each vertex when the triangle is rotated 90, 180, and 270 degrees.
Pre-image coordinates: A = (1,2); B = (5,3); C = (4,6)
Rotated 90 degrees: A' = B' = C' =
Rotated 180 degrees: A' = B' = C' =
Rotated 270 degrees: A' = B' = C' =
3. Decribe the change in the coordinates with a 90 degree rotation.
4. Decribe the change in the coordinates with a 180 degree rotation.
5. Decribe the change in the coordinates with a 270 degree rotation.
6. When the triangle is being rotated, what happens to the size and shape of the triangle?

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