In the following diagram (not to scale), A, B, C, D are four consecutive vertices of an 18-sided regular polygon with center O. Let P be the midpoint of A C and Q be the midpoint of D O. Find \angle O P Q in degrees.
In the following diagram (not to scale), A, B, C, D are four consecutive vertices of an 18-sided regular polygon with center O. Let P be the midpoint of A C and Q be the midpoint of D O. Find \angle O P Q in degrees.