Level:
Project ID:
2010005903
Source Problem:
Accepted:
0
Clonable:
1
Easy:
0
Find the values of the real parameter \(r\)
which ensure that the line \(x = r\)
is a tangent to the circle
\[
x^{2} + y^{2} - 4x + 10y + 4 = 0.
\]
\(\{-3;7\}\)
\(\{ - 7;3\}\)
\(\{ - 10;0\}\)
\(\{ 0;10\}\)