1
Q
d = r1 + r2
A
circles touch externally
2
Q
d > r1 + r2
A
circles do not touch
3
Q
r1 - r2 < d < r1 + r2
A
the circles meet at two distinct points
4
Q
d = r1 - r2
A
the circles touch internally
5
Q
d < r1 - r2
A
the circles do not touch
Higher Maths
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