Question

find equation of circle with centre of origin and radius is 5​

Answer 1

Correct option is

C

x2+y2=25

Compare the equation with the standard form with center at (h,k) and radius r is: (x−h)2+(y−k)2=r2

Substitute the value of (h,k)=(0,0) and r=5

Then, the equation becomes x2+y2=25