Higher: The Circle Basics
 1. Give the coordinate f the centre of the circle with equation x2 + y2 = 30A) (-3,0)B) (0,0)C) (-5,-4)D) (3,2)2. Give the coordinate f the centre of the circle with equation (x + 7)2 + (y + 3)2 = 45A) (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 = 17A) (-2,10)B) (1,5)C) (2,10)D) (-1,-5)4. Calculate the radius of the circle with equation (x + 2)2 + (y - 7)2 = 121A) 121B) 15C) 11D) 125. Calculate the radius of the circle with equation (x - 5)2 + (y - 1)2 = 17A) √17B) 7C) √13D) 176. A circle with its centre at (1,1) and with a radius of 5 has the equation:A) (x + 1)2 + (y + 1)2 = 25B) (x - 1)2 - (y - 1)2 = 25C) (x - 1)2 + (y - 1)2 = 5D) (x - 1)2 + (y - 1)2 = 257. Calculate the radius of the circle with equation x2 - 8x + y2 + 2y + 8 = 0A) √3B) 4C) 3D) √128. Give the coordinate f the centre of the circle with equation x2 - 8x + y2 + 2y + 8 = 0A) (4,-1)B) (-4,1)C) (8,-2)D) (-8, 2)9. A circle with its centre at (0,0) and with a radius of 9 has the equation:A) x2 - y2 = 81B) x2 + y2 = 64C) x2 + y2 = 81D) x2 + y2 = 910. A circle with its centre at (0,-8) and with a radius of 11 has the equation:A) x2 + (y + 8)2 = 121B) x2 + y2 =121C) x2 + y2 + 16y - 11 = 0D) (x + 8)2 + (y - 8)2 = 121
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