SOLUTION: Show that the points (-2,5),(-2,-1) and (4,-1) all lie on a circle whose center is at (1,2). Find the length of the radius.
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Question 166148: Show that the points (-2,5),(-2,-1) and (4,-1) all lie on a circle whose center is at (1,2). Find the length of the radius.
Answer by Mathtut(3670) (Show Source): You can put this solution on YOUR website!
since C(1,2) is the center if all lie on the circle then the distance between each point and C should be equal and would be the length of the radius.
distance between 2 points is
so distance between the following points and C are:
(-2,5) ---->=
(-2,-1) --->=
(4,-1) ---->=
they all lie on the circle with a radius of
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