Find the centre and radius from x² + y² + Dx + Ey + F = 0

Question 1

Find the centre of the circle x² + y² + 8x + 2y + 1 = 0. Type it like (2, −1).

Answer 

Question 2

Find the radius of the circle x² + y² + 12x − 12y + 36 = 0.

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Question 3

Find the centre of the circle x² + y² − 2x − 6y − 6 = 0. Type it like (2, −1).

Answer 

Question 4

Find the radius of the circle x² + y² + 4x − 8y + 11 = 0.

Answer 

Question 5

Find the centre of the circle x² + y² − 6x − 8y − 39 = 0. Type it like (2, −1).

Answer 

Question 6

Find the radius of the circle x² + y² + 10x + 8y − 40 = 0.

Answer 

Question 7

Find the centre of the circle x² + y² + 12x + 6y + 36 = 0. Type it like (2, −1).

Answer 

Question 8

Find the radius of the circle x² + y² − 10x + 10y + 49 = 0.

Answer 

Question 9

Find the centre of the circle x² + y² + 12x + 6y + 20 = 0. Type it like (2, −1).

Answer 

Question 10

Find the radius of the circle x² + y² + 8x + 12y − 12 = 0.

Answer 

Question 11

Find the centre of the circle x² + y² − 2x − 4y − 59 = 0. Type it like (2, −1).

Answer 

Question 12

Find the radius of the circle x² + y² + 10x − 4y + 28 = 0.

Answer 

Question 13

Find the centre of the circle x² + y² − 8x − 6y − 11 = 0. Type it like (2, −1).

Answer 

Question 14

Find the radius of the circle x² + y² + 6x − 4y + 12 = 0.

Answer 

Question 15

Find the centre of the circle x² + y² + 12x + 8y + 27 = 0. Type it like (2, −1).

Answer 

Question 16

Find the radius of the circle x² + y² − 12x − 4y + 4 = 0.

Answer