CircleHard

Question

The two circles x2 + y2 = ax and x2 + y2 = c2 (c > 0) touch each other if

Options

A.|a| = c
B.a = 2c
C.|a| = 2c
D.2 |a| = c

Solution

;      c2 = (0, 0)
;       r2 = c
c1c2 = r1 - r2     ⇒    ⇒ c = a

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