PROBLEM with 10 10 332 S
 

hello
I have a problem with the plans 10 10 332 S I read on the C of 180mm 2 cut of 3083mm but how is this possible with an angle of 60° it is too short it s ok with 2 angles of 45° there is necessarily something I don't understand? thank you for enlightening if you have been confronted with this reflection