Pythagorean theorem

The polar coordinate system describes the location of a point (denoted as [r,0]) in a plane by specifying a distance r and an angle 0 from the origin of the system. There are several relationships between polar and rectangular coordinates, diagrammed in Figure 1-30. From the Pythagorean Theorem  [c.34]

To convert rectangular coordinates to polar coordinates, given the point (x,y), using the Pythagorean Theorem and the preceding equations.  [c.34]

See pages that mention the term Pythagorean theorem : [c.7]   
Introduction to chemical engineering analysis using mathematica (2002) -- [ c.91 , c.99 ]

Standard Handbook of Petroleum and Natural Gas Engineering Volume 1 (1996) -- [ c.34 ]