Gearx P113.501, Manual, Page: 10 / 19

Primary Pythagorean:
In this mode, the system uses the Pythagorean law a2+b2=c2. The
third side measurement data is automatically measured by the two
side measurement data.
This mode can calculate the length of the target edge only by running
the Pythagorean law once, which is also called Primary Pythagorean
mode. Short press the main button to measure data c, and press
again to measure data b. After measuring the two data, the meter
automatically calculates the length of data a.