Rotation by 90 degrees

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The sketch shows the transformation of rotating the plane by 90 degrees about the origin. Drag point A. How do the coordinates of image A' relate to A?

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Iso triangle proof
Distance and Time Graph
Page 220 8a.
Jazzy Rabbit Band
Movable Rectangle

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矩形
長方體
直方圖
幾何變換
黎曼和（Riemann Sum）

Rotation by 90 degrees

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