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Page 1

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C1 CIRCLES Answers - Worksheet A

1 a x2 + y2 = 25 b (x - 1)2 + (y - 3)2 = 4 c (x - 4)2 + (y + 6)2 = 1
d (x + 1)2 + (y + 8)2 = 9 e (x + 1 2
2
)…

Page 2

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C1 CIRCLES Answers - Worksheet A page 2


7 a centre (0, 0) radius 8 b (x - 1)2 - 1 + (y - 3)2 - 9 - 26 = 0
dist. pt to centre = 9 (x - 1)2 + (y - 3)2 = 36
outside circle centre (1,…

Page 3

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C1 CIRCLES Answers - Worksheet A page 3


14 a (x - 3)2 - 9 + (y - 5)2 - 25 + 16 = 0 15 a (x + 2)2 - 4 + y2 = 13
centre (3, 5) centre (-2, 0)
5-2 0-4
b grad = = -1 grad…

Page 4

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C1 CIRCLES Answers - Worksheet A page 4

20 sub. 21 sub.
x2 + (x + k)2 + 6x - 8(x + k) + 17 = 0 x2 + m2x2 - 8x - 16mx + 72 = 0
2x2 + (2k - 2)x + k2 - 8k + 17 =…

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