Question 28If $\triangle A_1A_2A_3$ is equilateral and $A_{n+3}$ is the midpoint of line segment $A_nA_{n+1}$ for all positive integers $n,$ then the measure of $\angle A_{44}A_{45}A_{43}$ equals $30^\circ$$45^\circ$$60^\circ$$90^\circ$$120^\circ$
