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Question

If BOA=210 and BOC=120, find COA.

A
60
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B
30
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C
90
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D
150
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Solution

The correct option is C 90
BOC and COA are adjacent angles with common vertex, O and common arm, CO.

BOC and COA are adjacent angles, BOA=BOC+COA

COA=BOABOC
=210120=90

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