Question

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

Answer 1

67 degrees

Explanation:

Answer 2

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.