Question:medium
In the family of concentric circles $2(x^2 + y^2) = k$, the radius of the circle passing through $(1, 1)$ is:
In the family of concentric circles $2(x^2 + y^2) = k$, the radius of the circle passing through $(1, 1)$ is:
Show Hint
For circles centered at origin, radius = distance from origin to any point on circle:
\[
R = \sqrt{x^2 + y^2}
\]
Updated On: May 2, 2026
- $\sqrt{2}$
- $4$
- $2\sqrt{2}$
- $1$
- $3\sqrt{2}$
Show Solution
The Correct Option is A
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