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

Mathematics
Tutor: None Selected Time limit: 1 Day

Oct 31st, 2015

hello


w is  inscribed angles to arc AC, 

w =84 /2

w =42


ANSWER IS  option C

C . 42°


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

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Oct 31st, 2015
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