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A day full of math games & activities. Find one near you.
Solution:
The general equation of the circle is given by
(x - h)2 + (y - k)2 = r2
Where, (h, k) is the center
r is the radius
Given,
The equation of the circle is x2 + y2 = 9
So, r2 = 9
Taking square root,
r = 3
Therefore, the radius of the circle is 3 units.
Summary:
The radius of the circle whose equation is x2 + y2 = 9 is 3 units.