Point z not shown lies inside the circle with center p and radious of 2
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Given a circle (coordinates of centre and radius) and a point (coordinate), find if the point lies inside or on the circle, or not.
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In the xy-plane, point (r, s) lies on a circle with center at the origin. What is the value of ?
Now, as then the question asks about the value of radius^2.
(1) The circle has radius 2 --> radius^2=4. Sufficient.
(2) The point lies on the circle --> substitute x and y coordinates of a point in --> . Sufficient.
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