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1 Unit 1: Pure Mathematics A

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Question 132

The circle C1 C_1\,C1​ has equation x2+y2−4x+6y−12=0x^2+y^2-4x+6y-12=0x2+y2−4x+6y−12=0.

The circle C2 C_2\,C2​ has equation (x−8)2+(y+3)2=k2(x-8)^2+(y+3)^2=k^2(x−8)2+(y+3)2=k2, where k>0k>0k>0.

Find all values of k k\,k for which the circles touch.

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1 Unit 1: Pure Mathematics A Questions

  1. A Level
  2. /Maths
  3. /1 Unit 1: Pure Mathematics A

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