briannaml
briannaml
02-05-2018
Mathematics
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PLZ HELP ASAP LAST CIRCLES
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Blitztiger
Blitztiger
02-05-2018
AC and AB are tangents to circle O, meaning that the angles C and B are right angles of 90 degrees. Since a quadrilateral's internal angles must sum up to 360 degrees, this means that A + B + C + O = 360
70 + 90 + 90 + O = 360
O = 110 degrees.
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