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

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