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1 Unit 1: Pure Mathematics A

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Question 272

Two circles have radii r1 r_1\,r1​ and r2r_2r2​, and the distance between their centres is ddd.

a.

State the condition for the circles to touch externally.

[1]
b.

State the condition for the circles to touch internally.

[1]
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1 Unit 1: Pure Mathematics A Questions

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