Math problem, find the center and radius of the circle.

👨🏻‍🏫 學術台數學

[匿名]

2008-05-27 6:39 pm

Find the center and radius of the circle of the equation x^2+y^2 -2x +6y -15 = 0 at the point P(4, -7)

回答 (2)

Adelmen

2008-05-27 6:55 pm

Centre: [-(-2)/2 , -6/2 ] =(1,-3)
Radius: Square Root of [(-2/2)^2 + (6/2)^2 - (-15)] = 5

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BENNY鄭

2008-05-27 6:50 pm

centre of the circle=(-(-2/2),-6/2)
=(1,-3)

raidus of the circle=[(1^2)+(-3)^2-(-15)]^(1/2)
=(25)^(1/2)
=5

參考: myself

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