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Verified answer
Koordinat ujung-ujung diameter adalah (-4, -3) dan (6, 1). Jarak dua titik atau diameter dapat dicari dengan rumusMaka diameternya adalah...
d =
=
=
=
=
r = 1/2d
= 1/2 . 2√29
= √29
Titik tengahnya adalah...
P =
=
=
Persamaan lingkarannya adalah...
r² = (x - a)² + (y - b)²
(√29)² = (x - 1)² + (y - (-1))²
29 = x² -2x + 1 + (y + 1)²
29 = x² - 2x + 1 + y² +2y + 1
29 = x² + y² - 2x + 2y + 2
0 = x² + y² - 2x + 2y - 27
Maka jawaban yang tepat adalah A. x² + y² - 2x + 2y - 27 = 0
Semoga membantu :)
Verified answer
Bab Persamaan lingkarand = (-4 , -3) dan (6 , 1)
titik pusat A = (6 -(-4))/2 =10/2 = 5
Titik Pusat B = (1-(-3)/2 = 4/2 = 2
(5,2)
a = 5
b = 2
r^2 = (5-4)^2 + (2-3)^2
r^2 = (1)^2 + (-1)^2
r^2 = 1 + 1
r^2 = 2
r^2 = (x-a)^2 + (y-b)^2
r^2 = (x-5)^2 + (y-2)^2
r^2 =(x-5).(x-5) + (y-2).(y-2)
r^2=x^2 + y^2 - 2x +2y -29
r^2 = x^2 + y^2 - 2x + 2y -29 + 2
x^2 + y^2 -2x + 2y - 27 = 0
====> A