Instructions.
Use this interactive tool to discover the rules for rotating coordinates on a Cartesian plane.
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Change the Angle: Drag the slider at the bottom to rotate triangle ABC by 0°, 90°, 180°, or 270°.
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Observe the Coordinates: Watch the text at the top left of the graph. It dynamically updates to show how the coordinates of vertices A, B, and C map to their new positions A’, B’, and C’.
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Test Your Own Shapes: Drag the vertices A, B, and C to create a new triangle and see if the coordinate rules you discovered still hold true!