The Inca officials specializing in astrological khipu appear to have learned to plot points on the coordinate plane
and to read the coordinates from a graph because that information could be numerically encoded on a khipu.
The center point is located in the 1st quadrant and does not represent the Cartesian coordinate plane
Furthermore, the power of the coordinate approach is that from the list of coordinates alone, the graph can be transferred to any setting--another student, a computer program, or even the wall--where a coordinate plane
Some lessons teach math concepts by using the robot to visualize coordinate planes
, degrees of movement and limitations.
After excitation frequency for stable and steady part alignment was experimentally set to all pegs (Table 1), motion trajectory of the tip was taken in all three coordinate planes
Data were collected from the coordinate planes
unit examination for prealgebra students, and the mean scores of those in the experimental and comparison groups were compared.