alleryEquation of sphere with center (h, k, l) and radius r:
A(x-h)² + (y-k)² + (z-l)² = r² (3D analog of circle)
Bx² + y² + z² = h²
Cx + y + z = r
Dx = h
Answer & Solution
Correct answer: A. (x-h)² + (y-k)² + (z-l)² = r² (3D analog of circle)
**Sphere:** set of points at distance r from center.
(x-h)² + (y-k)² + (z-l)² = r².
3D extension of circle equation.
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