Triangle A has vertices at (1, 2), (3, 2) and (3, 4). Rotate triangle A by 90° anticlockwise about the origin (0, 0). Write the coordinates of the image.
📐 Rotation Rules (about a point C)
90° ACW: (x,y) → (−y, x)
90° CW: (x,y) → (y, −x)
180°: (x,y) → (−x, −y)
−90° = 90° CW
⚡ Always: Translate → Rotate → Translate back
⚠️ Examiner Trap
Don't flip the signs incorrectly. For 90° anticlockwise: (x, y) → (−y, x).
Gen Z Study · Edexcel 4MA1 · Rotations Progressive Test
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