Question

State the radius of this circle: X^2 +Y^2=121

Answer 1

Answer:

radius = 11

Step-by-step explanation:

The equation of a circle centred at the origin is

x² + y² = r² ( where r is the radius )

x² + y² = 121 ← is the equation of a circle centred at the origin

with r² = 121 , then

r = $\sqrt{121}$ = 11