Question

find equation of a circle with centre
at origin and radius 3​

Answer 1

Answer:

Given:     centre (0,0)    and radius = 3 unit

now,

⇒ Equation of circle

   ( x -a)² + (y -b)² = r²

(here a & b are center point of circle & r = radius)

now,

centre at origin and radius 3

⇒ x² + y² = (3)²

⇒  x² + y² = 9 is the correct eqaution