TMUA 2019 Paper 1 Q6 — Worked Solution

P1·Coordinate Geometry·6.0Official · 2019 · Q6

circlestangencydistance-between-centres

The circles with equations

(x + 4)^{2} + (y + 1)^{2} = 64 and (x - 8)^{2} + (y - 4)^{2} = r^{2} (r > 0)

have exactly one point in common. Find the difference between the two possible values of

r

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