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Mathematics
Mathematics
Problem
The radius of the circle in which the sphere
x
2
+
y
2
+
z
2
+
2
x
−
2
y
−
4
z
−
19
=
0
x^2 + y^2 + z^2 + 2x - 2y - 4z - 19 = 0
x
2
+
y
2
+
z
2
+
2
x
−
2
y
−
4
z
−
19
=
0
is cut by the plane
x
+
2
y
+
2
z
+
7
=
0
x + 2y + 2z + 7 = 0
x
+
2
y
+
2
z
+
7
=
0
is a. 2 b. 3 c. 4 d. 1
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