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ACT MATH · Coordinate Geometry · Standard

Coordinate Geometry: Rotate math math counterclockwise about the origin.

Lines, distance, midpoint.

Try the problem

Rotate (3,1)(3,1) 90∘90^\circ counterclockwise about the origin.

Hint and answer

Concept to use

Distance formula.

Hint

Map (x,y)(x,y) to (−y,x)(-y,x).

Answer

(-1,3)

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