Question

centre of circle is origin and radius is 5 unit . What is equation of the circle?​

Answer 1

THIS IS YOUR ANSWER

Distance between lines x=1 and x=−1

r−2 units 

centre , 0≡(h,k)≡(0,0)

Equation : (x−h)2+(y−k)2=r2

(x−0)2+(y−0)2=22

∴x2+y2=4

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