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b) Write an equation for this function, in the form y = a sin kx

My answer:

2Pi / k = 10

10k = 2Pi

k = Pi/5

y = 100sin(Pi/5)x

Now my question is regarding the wording of the question. It says that it can sway back and forth as much as 100 cm but does not state if that is the diameter or radius. Am I correct in thinking it is referring to the radius?

Or would the correct answer be: y = 50sin(Pi/5)x because it swings 50 cm each way? Sorry to ask such a stupid question I'm just not 100% sure what it is asking.