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(x - a)² + (y - b)² = r²
Titik pusatnya (1, -3). Berarti a = 1, b = -3
Melalui titik (4, 1). Berarti x = 4, y = 1
(x - a)² + (y - b)² = r²
(4 - 1)² + (1 + 3)² = r²
3² + 4² = r²
9 + 16 = r²
r² = 25
Lingkaran itu juga melalui titik (6,m). Berarti x = 6, y = m
(x - a)² + (y - b)² = r²
(6 - 1)² + (m + 3)² = 25
5² + (m + 3)² + 25
25 + (m + 3)² = 25
(m + 3)² = 25 - 25
(m + 3)² = 0
m + 3 = 0
m = -3
Jadi, nilai dari m adalah -3