The following graph shows a semicircle which passes (-7,0), (-5,5), (0,7), (5,5), (7,0).


State the centre of the semicircle.

Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
Question: The following graph shows a semicircle which passes (-7,0), (-5,5), (0,7), (5,5), (7,0).


State the centre of the semicircle.

Please first conduct reasoning, and then answer the question and provide the final value, e.g., 1, 2.5, 300, at the end.
Question: The following graph shows a semicircle which passes (-7,0), (-5,5), (0,7), (5,5), (7,0).


State the centre of the semicircle.
