How can I understand geometry in order to solve the following?

Mathematics
Tutor: None Selected Time limit: 1 Day

Oct 31st, 2015

hello


m GF + 40+80+110 = 360

m GF +230 =360

m GF = 360 - 230

m GF = 130


ANSWER IS option D

m GF= 130 



hope you understood..please message if you have any doubts...thank you
Oct 31st, 2015

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