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Mathematics
Problem
The two circles
x
2
+
y
2
=
a
x
x^2 + y^2 = ax
x
2
+
y
2
=
a
x
and
x
2
+
y
2
=
c
2
x^2 + y^2 = c^2
x
2
+
y
2
=
c
2
(
c
>
0
c > 0
c
>
0
) touch each other if a.
∣
a
∣
=
c
|a| = c
∣
a
∣
=
c
b.
a
=
2
c
a = 2c
a
=
2
c
c.
∣
a
∣
=
2
c
|a| = 2c
∣
a
∣
=
2
c
d.
2
∣
a
∣
=
c
2|a| = c
2∣
a
∣
=
c
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