The center of a circle is at (0, 0), and the radius of the circle is 3 2 . Which equation represents the circle?

Question

asked Jul 26, 2020 195k views

2 Answers

Anthony Chung · Answer 1 · 2020-07-26T21:00:51+0000

Answer:

x² + y² = 9

Explanation:

The equation of a circle centred at the origin is

x² + y² = r² ← r is the radius

Here r = 3, hence

x² + y² = 3² ⇒ x² + y² = 9