Question

What is the equation of a circle with a center at (4,-9) and a radius of 5?

Answer 1

(x - 4)² + (y + 9)² = 5²

Explanation:

The standard form equation is

(x - h)² + (y - k)² = r²

(h, k) is the center

r is the radius

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Given (h, k) = (4, -9) and r = 5

(x - 4)² + (y + 9)² = 5²