Points `P` and `Q`, shown on the Cartesian plane diagram, are rotated 180° about the origin and become points `P^(′)` and `Q^(′)`.
Plot the points `P^(′)` and `Q^(′)` on the diagram. (3 marks)
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`text{Rotating 180° = Rotating 90° twice (in either direction)}`
`text{1st 90° rotation (clockwise):}`
`P(-2,-1)\ ->\ (-1,2)`
`Q(4,-2)\ ->\ (-2,-4)`
`text{2nd 90° rotation (clockwise):}`
`(-1,2)\ ->\ P^(′)(2,1)`
`(-2,-4) \ ->\ Q^(′)(-4,2)`
