Question : Find the radius of the circle $x^2+y^2=25$.
Option 1: 25 units
Option 2: 5 units
Option 3: 2 units
Option 4: 12 units
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Correct Answer: 5 units
Solution : Equation of a circle with centre (0,0): $x^2+y^2=r^2$ where $r$ is the radius of the circle. The radius of the circle $x^2+y^2=25$ ⇒ $r=\sqrt{25}$ = 5 units Hence, the correct answer is 5 units.
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