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Dilations: scale factor

Problem

Triangle ABC is the image of ABC under a dilation with a scale factor of 2.
A first quadrant coordinate plane.A triange has vertices A at nine, five, B at nine, two, and C at seven, one.
What is the length of segment AB?
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi
units
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