Higher: The Circle Basics
 1. Give the coordinate f the centre of the circle with equation x2 + y2 = 30A) (-3,0)B) (-5,-4)C) (3,2)D) (0,0)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) (1,5)B) (-2,10)C) (-1,-5)D) (2,10)4. Calculate the radius of the circle with equation (x + 2)2 + (y - 7)2 = 121A) 12B) 121C) 15D) 115. 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 = 5C) (x - 1)2 + (y - 1)2 = 25D) (x - 1)2 - (y - 1)2 = 257. Calculate the radius of the circle with equation x2 - 8x + y2 + 2y + 8 = 0A) √3B) √12C) 4D) 38. 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 = 81C) x2 + y2 = 9D) x2 + y2 = 6410. 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 + 16y - 11 = 0C) x2 + y2 =121D) (x + 8)2 + (y - 8)2 = 121
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