Dilations Change Length by Scale Factor Practice Test

Triangle $GHI$ is dilated about center $O$ with scale factor $k=2$ to form triangle $G'H'I'$. Which conclusion follows from the dilation shown?

Quadrilateral $PQRS$ is dilated about center $O$ with scale factor $k=\tfrac{1}{2}$ to form $P'Q'R'S'$. Which statement correctly describes the effect of the dilation on segment length?