SOLUTION: Equation of a Circle 11.a) State the radius of the circle given by the equation x^2+y^2=169 Thank you sooooo much!!!!

Question 189843: Equation of a Circle
11.a) State the radius of the circle given by the equation x^2+y^2=169
Thank you sooooo much!!!!
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Start with the given equation

Rewrite as

Rewrite as and as

Notice how the last equation is of the form (which is the general equation of a circle) where (h,k) is the center and "r" is the radius.

In this case, , and . So this is a circle centered at (0,0) with a radius of 13 units
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