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Topic: need help for the circle -_-
Replies: 8   Last Post: Jul 9, 2013 9:27 AM

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grei

Posts: 104
Registered: 11/27/12
Re: need help for the circle -_-
Posted: Jul 9, 2013 9:27 AM
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The fact that the circle is TANGENT to the y axis means that the radius from the center of the circle, (5, -2), to that point is perpendicular to the y-axis. And since the y-axis is vertical, that radius is horizontal. That means the circle is tangent to the y-axis at (0, -2). And that, in turn, means that the radius of the circle is 5.

The point (-4, 3) will lie on that circle if and only if the distance from (5, -2) to (-4, 3) is 5.



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