Question

Which of the following is the equation of a circle whose center is at the origin and whose radius is 4

?School District of Manatee County
April Siegler

Answer 1

x² + y² = 16

the equation of a circle centred at the origin is

x² + y² = r² ( where r is the radius )

here r = 4, hence

x² + y² = 16 ← is the equation of the circle