TFE question...

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hope_to_match

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TFE_zps3c7631d8.png
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I only got this answer correct by process of elimination..I see why others don't work now that I am reviewing the test. BUT i put an arrows there because I am not sure where these dotted lines are coming from..can someone help me with this?
 
if you look at the front view, I think it comes from the curve part and the other side of it. The other side that invaginates on the front view.
 
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