The z-axis is the vertical line on a three-dimensional coordinate system. In terms of volume calculations using Washer Method, it serves as the axis around which the region between two curves is being revolved.
Related terms
Coordinate Plane: A two-dimensional plane formed by the intersection of x and y axes on a three-dimensional coordinate system.
Origin: The point (0,0) where both x and y axes intersect on a coordinate plane.
Three-Dimensional Space: A space that includes length, width, and height dimensions.