Respuesta :

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.

Answer:

67 degrees

Step-by-step explanation: