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Rasa Bhattarai

For detail explanation of my above question:
On the last page of the tobii Article, it mentions ” The nine stimuli points are placed within a 20° visual angle. See detailed information in the “Accuracy and Precision Test Method
for Remote Eye Trackers” specification at Tobii.com”.

My question is how can we calculate 20 degree visual angle while placing the stimuli points ? Would you please elaborate this ?

Thank you