# Calculus-Surfaces in space

**Tutor description**

sphere: (x – xo)2 + (y – yo)2 + (z – zo)2 = r2 plane: ax + by + cz + d = 0 Cylindrical surfaces If you move a vertical line around the circle x2 + y2 = a2, it generates a right circular cylinder; the circle is the generating curve (or directrix); the line is called a ruling.

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