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Find the radius of a circle with the equation:
x^2 + y^2 – 18x – 24y + 124 = 0

 Dec 24, 2021
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Complete the square for x and y

 

x^2 -18x      + y^2 - 24 y =     -124

(x-9)^2        + ( y -12)^2  =  - 124 +81 + 144     <===== the red part = r^2

                                       =  101                                r = sqrt (101)

    

 Dec 24, 2021

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