stimulus size in degrees of visual angle

[Maggie]

Hello,
 
I'm just starting to learn how to use eprime and I've run into some trouble 
with the stimulus size. I need to place a geometric shape (i.e. triangle or 
square) above the fixation point, and it needs to be 3.8*°* x 3.8*° *in 
size. How to I convert this into pixels exactly? I'm assuming the size 
(height and width) in properties are in pixels too, right?
 
Many thanks,
Maggie

 

 

 

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