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

Question 1

Find the radius of the circle x² + y² − 2x + 8y + 8 = 0.

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Question 2

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

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Question 3

Find the radius of the circle x² + y² + 2x − 4y − 4 = 0.

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Question 4

Find the centre of the circle x² + y² − 4x + 2y − 20 = 0. Type it like (2, −1).

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Question 5

Find the radius of the circle x² + y² + 6x − 8y + 21 = 0.

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Question 6

Find the centre of the circle x² + y² − 4x + 8y − 5 = 0. Type it like (2, −1).

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Question 7

Find the radius of the circle x² + y² − 10x + 4y + 13 = 0.

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Question 8

Find the centre of the circle x² + y² − 2x + 10y + 25 = 0. Type it like (2, −1).

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Question 9

Find the radius of the circle x² + y² + 6x − 6y + 9 = 0.

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Question 10

Find the centre of the circle x² + y² − 2x + 10y + 1 = 0. Type it like (2, −1).

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Question 11

Find the radius of the circle x² + y² + 12x + 12y − 9 = 0.

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Question 12

Find the centre of the circle x² + y² + 4x + 2y − 76 = 0. Type it like (2, −1).

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Question 13

Find the radius of the circle x² + y² + 8x + 6y − 39 = 0.

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Question 14

Find the centre of the circle x² + y² − 12x − 6y + 41 = 0. Type it like (2, −1).

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Question 15

Find the radius of the circle x² + y² + 8x − 6y + 24 = 0.

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Question 16

Find the centre of the circle x² + y² + 2x − 6y − 54 = 0. Type it like (2, −1).

Answer