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Maksudnya persamaan lingkaran kan ya.Oke gaess !!
★ Melalui titik (-1, 3)
Maka nilai a = -1 dan nilai b = 3
★ Mencari nilai r
Diameter = d = √40 = 2√10
r = d÷2 = 2√10 ÷ 2 = √10
Maka, nilai r² = 10
★ Persamaan umum lingkaran
(x - a)² + (y - b)² = r²
(x - (-1))² + (y - 3)² = 10
(x + 1)² + (y - 3)² = 10
x² + 2x + 1 + y² - 6y + 9 = 10
x² + y² + 2x - 6y + 10 - 10 = 0
x² + y² + 2x - 6y = 0
Makasih