10. AC is tangent to circle o at point C, find the measure of OAC.
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the answer is 120 °
Step-by-step explanation:
In triangle OAC,
COA = 30° [ GIVEN ]
OCA = 90° [ A/C TO theoram 10.1 tangents at any point of the circle is perpendicular to the radius at the point of contact
we know that,
COA + OCA + OAC = 180ﾟ [ SUM OF THE ANGLE OF TH TRIANGLE
= OAC = 180 - ( 90 + 30 )
THEREFORE, OAC = 120 °
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