alleryEquation of circle with center (h, k) and radius r:
Ax + y = r
Bx² + y² = h
Cx² = r
D(x - h)² + (y - k)² = r²
Answer & Solution
Correct answer: D. (x - h)² + (y - k)² = r²
Standard equation of circle.
For center (0,0): x² + y² = r².
**General second-degree:** x² + y² + 2gx + 2fy + c = 0, center (-g, -f), radius sqrt(g² + f² - c).
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