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Mathematics
Problem
The curve defined in polar form by
r
=
4
cos
θ
r = 4\cos\theta
r
=
4
cos
θ
can be written in Cartesian coordinates as which of the following equations? a)
x
2
+
y
2
=
16
x^{2}+y^{2}=16
x
2
+
y
2
=
16
b)
x
2
+
y
2
=
4
x
x^{2}+y^{2}=4x
x
2
+
y
2
=
4
x
c)
x
2
+
y
2
=
4
y
x^{2}+y^{2}=4y
x
2
+
y
2
=
4
y
d)
x
2
+
y
2
=
16
x
x^{2}+y^{2}=16x
x
2
+
y
2
=
16
x
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