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Amplitude of sinusoidal functions from graph

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Below is the graph of a trigonometric function. It intersects its midline at (23π,1.2), and it has a minimum point at (43π,3.4).
A graph of a trigonometric wave on an x y coordinate plane. The x and y axes scale by one. There is a point on the lowest part of the graph labeled (four pi over three, negative three and four tenths). A point is on the graph and midline at (two pi over three, one and two tenths).
What is the amplitude of the function?
  • 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