Question

Equation of a circle whose centre is origin and radius is equal to the distance between the lines $x = 1$ and $x = - 1$ is.

• A. $x ^ { 2 } + y ^ { 2 } = 1$
• B. $x ^ { 2 } + y ^ { 2 } = \sqrt { 2 }$
• C. $x ^ { 2 } + y ^ { 2 } = 4$
• D. $x ^ { 2 } + y ^ { 2 } = - 4$

Answer 1

Answer: (C)

$x ^ { 2 } + y ^ { 2 } = 4$

Answer 2

Radius = 2, C (0, 0)

Equation of circle can be found from this.