The midpoint of the two points will be the center of the circle. The midpoint is simply the average of the endpoints coordinates...
((6-2)/2, (4+8)/2)
(2, 6) is the center of the circle.
Answer: The third choice
Step-by-step explanation:

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Answer:
Linear pair is two adjacent angles whose non-common side from opposite rays. the line through points A., B and C is straight line. if two angles from a linear pair the angle are supplementary.