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y / r2 = a constant (k) so k = 405/81 ie 5. k = y/4 when r = 2, so y = 20.

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y / r2 = a constant (k) so k = 405/81 ie 5. k = y/4 when r = 2, so y = 20.

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The equation for a circle of radius r and centre (h, k) is:

(x - h)² + (y - k)² = r²

If the centre is the origin, the centre point is (0, 0), thus h = k = 0, and this becomes:

x² + y² = r²

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r c y

o k

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j e r k y

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The letters EATRPRYKY have the anagram "Katy Perry."

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