Griffin Lawson
01/11/2024 · Junior High School

The equation of the circle \( C \) is \( x^{2}+y^{2}-2 x-12 y-252=0 \). Denote the centre of \( C \) by \( G \). The coordinates of the point \( A \) are \( (19,30) \). (a) Find the distance between \( A \) and \( G \). (b) Let \( P \) be moving point in the rectangular coordinate plane such that \( P \) is equidistant from \( A \) and \( G \). Denote the locus of \( P \) by \( \Gamma \). (i) Describe the geometric relationship between \( \Gamma \) and \( A G \). (ii) Suppose \( \Gamma \) cuts \( C \) at the points \( M \) and \( N \). Find the perimeter of \( \triangle A M N \).

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**Problem (a):** The distance between point \( A(19, 30) \) and the center \( G(1, 6) \) of the circle is \( 30 \). **Problem (b):** (i) The locus \( \Gamma \) of point \( P \) is the perpendicular bisector of segment \( AG \). (ii) The perimeter of triangle \( AMN \) is \( 60 \).

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