1. 
   indirect measurement
   The technique of using similar figures and proportions to find a measure
   Example:
   
   Found op http://www.hbschool.com/glossary/math2/index6.html
   
   
2. 
   indirect method of measurement
   method of measurement in which the value of a quantity is obtained from measurements made by direct methods of measurement of other quantities linked to the measurand by a known relationship
   Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=311-02-02
   
   

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