For this case what you should do is use the equation shown. We have then: n * A = 360 Where: A=Angle n: number of divisions. We observe that there are eight divisions. Thus: n = 8 We then clear the angle between each division 8 * A = 360 A = 360/8 A = 45 degrees Answer: The measure of the angle between the mirrors is: A = 45 degrees