As shown in the figure, in the rectangular coordinate system, the coordinates of point P are (3,4). Rotate OP 90 ° counterclockwise around the origin o to get the line segment op ′. (1) draw the line segment op ′; (2) find the coordinates of P ′ and the length of PP ′

As shown in the figure, in the rectangular coordinate system, the coordinates of point P are (3,4). Rotate OP 90 ° counterclockwise around the origin o to get the line segment op ′. (1) draw the line segment op ′; (2) find the coordinates of P ′ and the length of PP ′


(1) (2) P ′ (- 4,3), PP ′ = 90 π × 5180 = 5 π 2



In the rectangular coordinate system, the point a (4,2.5) is rotated 90 ° counterclockwise around the origin, and the coordinates of the point are


（-2.5,4）

Elden Ring Premiere

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