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What are the best ways to measure geometric ability? 

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The best ways to measure geometric ability include using the Van Hiele Achievement Test, which assesses performance in geometry at different levels of thinking . Another method is the use of a geometric measurement system that employs techniques such as Shack-Hartmann wavefront sensing, phase diversity sensing, and white light interferometry to precisely measure surfaces of objects . Additionally, there are psychometric measures of spatial ability that can be used, such as the Kit of Factor-Referenced Cognitive Tests and other laboratory demonstrations . These measures have been found to have adequate reliability and can provide valuable information on spatial ability . The General Ability Measure for Adults (GAMA) is another option, which evaluates overall general ability using abstract designs and shapes . These various methods offer different approaches to measuring geometric ability and can be used depending on the specific needs of the study or assessment.

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The provided paper does not mention anything about measuring geometric ability. It focuses on a geometric measurement system and methods for measuring geometric characteristics of objects such as corneas, molds, contact lenses, etc.
The paper does not provide information on the best ways to measure geometric ability.
The paper does not provide information on the best ways to measure geometric ability. The paper focuses on the importance of spatial abilities in learning mathematics, particularly in the field of geometry, and the use of van Hiele's geometric thinking theory to assess students' understanding of geometric elements/components.
The paper does not provide information on the best ways to measure geometric ability.

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