could you please explain, how 3/2 comes here...?

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Consider a unit square centered at origin. The coordinates at the square are translated by a factor $\biggr( \frac{1}{2}, 1 \biggl)$ and rotated by an angle of 90$^o$. What shall be the coordinates of the new square?

- $\biggr(\frac{-1}{2},0 \biggl), \biggr( \frac{-1}{2},1 \biggl),\biggr( \frac{-3}{2},1 \biggl),\biggr( \frac{-3}{2},0 \biggl)$
- $\biggr( \frac{-1}{2},0 \biggl), \biggr( \frac{1}{2},1 \biggl),\biggr( \frac{3}{2},1 \biggl), \biggr( \frac{3}{2},0 \biggl)$
- $\biggr( \frac{-1}{2},0 \biggl), \biggr( \frac{1}{2},0 \biggl),\biggr( \frac{-3}{2},1 \biggl), \biggr( \frac{-3}{2},0 \biggl)$
- $\biggr( \frac{-1}{2},0 \biggl), \biggr( \frac{1}{2},1 \biggl),\biggr( \frac{-3}{2},1 \biggl), \biggr( \frac{-3}{2},0 \biggl)$

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