Circles and Translations (HSC SSCE Mathematics Advanced): Quizzes

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Circles and Translations
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What is the centre of the circle (x−3)2+(y+5)2=16(x - 3)^2 + (y + 5)^2 = 16?

(3,−5)(3, -5)

What is the radius of the circle (x−1)2+(y+2)2=49(x - 1)^2 + (y + 2)^2 = 49?

77

A circle has centre (4,−3)(4, -3) and radius 55. What is its domain?

[−1,9][-1, 9]

A circle has centre (−2,6)(-2, 6) and radius 33. What is its range?

[3,9][3, 9]

What is the equation of a circle centred at the origin with radius 44?

x2+y2=16x^2 + y^2 = 16

In (x−a)2+(y−b)2=r2(x - a)^2 + (y - b)^2 = r^2, if a>0a > 0, which direction has the circle moved?

Right

Which form is x2+y2+6x−8y+5=0x^2 + y^2 + 6x - 8y + 5 = 0?

General form

To complete the square for x2+10xx^2 + 10x, what value should be added?

2525

A circle has centre (2,−4)(2, -4) and radius 66. What is its equation?

(x−2)2+(y+4)2=36(x - 2)^2 + (y + 4)^2 = 36

In (x−a)2+(y−b)2=r2(x - a)^2 + (y - b)^2 = r^2, if b<0b < 0, which direction has the circle moved?

Down

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