For this question, if one of the given options was 2π (6.28), which would be the length of arc RT, should we be selecting that instead of the given answer i.e. D) 4 ?
Yes, you are right. The maximum distance between the two points is 2π which could be the correct answer.
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The line segment between two points R & T on a circle is called a chord.
The longest possible chord would be a diameter of length 2r.
in this case giving a maximum length for RT of 4 units.
Thanks for confirming!
Yep, that right