AC is tangent to circle O at point C. What is the measure of O?

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asked Dec 7, 2019 210k views

2 Answers

Kirschmichel · Answer 1 · 2019-12-11T10:42:03+0000

AC is tangent at point C, which makes a right angle with line OC.

That means that angle C = 90 degrees.

The 3 angles of a triangle need to equal 180.

Subtract the two known angles from 180 to find angle O:

O = 180 - 90 - 23 = 67 degrees.