A section of theater is arranged so that each row has the same number of seats, Ann is seated in the fifth row from the front and the third row from the back. Her seat is sixth
from the left and second from the right. How many seats are in this section.

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq

umumumumum

im not sure