- 1. Give the coordinate f the centre of the circle with equation x2 + y2 = 30
A) (3,2) B) (-5,-4) C) (-3,0) D) (0,0)
- 2. Give the coordinate f the centre of the circle with equation (x + 7)2 + (y + 3)2 = 45
A) (7,3) B) (-7,-3) C) (-7,3) D) (7,-3)
- 3. Give the coordinate f the centre of the circle with equation (x - 2)2 + (y - 10)2 = 17
A) (2,10) B) (1,5) C) (-1,-5) D) (-2,10)
- 4. Calculate the radius of the circle with equation (x + 2)2 + (y - 7)2 = 121
A) 11 B) 15 C) 121 D) 12
- 5. Calculate the radius of the circle with equation (x - 5)2 + (y - 1)2 = 17
A) 17 B) 7 C) √13 D) √17
- 6. A circle with its centre at (1,1) and with a radius of 5 has the equation:
A) (x - 1)2 + (y - 1)2 = 25 B) (x + 1)2 + (y + 1)2 = 25 C) (x - 1)2 - (y - 1)2 = 25 D) (x - 1)2 + (y - 1)2 = 5
- 7. Calculate the radius of the circle with equation x2 - 8x + y2 + 2y + 8 = 0
A) 4 B) 3 C) √3 D) √12
- 8. Give the coordinate f the centre of the circle with equation x2 - 8x + y2 + 2y + 8 = 0
A) (-4,1) B) (-8, 2) C) (4,-1) D) (8,-2)
- 9. A circle with its centre at (0,0) and with a radius of 9 has the equation:
A) x2 + y2 = 81 B) x2 + y2 = 9 C) x2 - y2 = 81 D) x2 + y2 = 64
- 10. A circle with its centre at (0,-8) and with a radius of 11 has the equation:
A) x2 + (y + 8)2 = 121 B) x2 + y2 =121 C) (x + 8)2 + (y - 8)2 = 121 D) x2 + y2 + 16y - 11 = 0
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