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Oh I'm sorry<3 I don't know this one. Try @ParthKohli or @lgbasallote I'm really sorry.

yeah sure tag the poor lgba :(

It would be 180 - 60

which is...

120..but can you explain to me why? becuase I want to learn for next time!

sure

if you have 4 parallel lines like this
|dw:1339087707750:dw|

all the intersections are exactly the same

|dw:1339087829646:dw|

so those angles are exactly the same

oh ok!

|dw:1339087867430:dw|

so that angle is 60

and they told us its against a line

|dw:1339087912601:dw|

so from there to there is 180

all thats left is the difference

will that technique work on all equations?

no!!

the arc simply mean that they are different angles

they dont have to be different by a factor of 2 tho

oh ok I see! thanx ;)

=)