Triangle ABC was transformed using the rule $ (x, y) \quad $ Which best describes the transformation? $ \rightarrow(-y, x) $. The vertices of the triangles are shown.
The transformation was a $ 90^{\circ} $ rotation about the
$ A(-1,1) \quad A^{\prime}(-1,-1) $ origin.
$ B(1,1) \quad B^{\prime}(-1,1) $
The transformation was a $ 180^{\circ} $ rotation about the
C $ (1,4) \quad C^{\prime}(-4,1) $ origin.
The transformation was a $ 270^{\circ} $ rotation about the origin.

The transformation was a $ 360^{\circ} $ rotation about the origin.

Question

Triangle ABC was transformed using the rule $ (x, y) \quad $ Which best describes the transformation? $ \rightarrow(-y, x) $. The vertices of the triangles are shown.
The transformation was a $ 90^{\circ} $ rotation about the
$ A(-1,1) \quad A^{\prime}(-1,-1) $ origin.
$ B(1,1) \quad B^{\prime}(-1,1) $
The transformation was a $ 180^{\circ} $ rotation about the
C $ (1,4) \quad C^{\prime}(-4,1) $ origin.
The transformation was a $ 270^{\circ} $ rotation about the origin.

The transformation was a $ 360^{\circ} $ rotation about the origin.

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