crrrrg wrote:

sgoll I don't know what the triangular rule is but yes it helped me draw a straight line joining all 3 points and then the triangle as SimaQ suggested. I don't think any other calculation is necessary. If the register is equidistant from both dressing rooms and they are separated by 16 feet then the minimum distance from either is 8 feet, anything less than that can't be.

By triangular rule i mean that the sum of any two sides of the triangle cannot be less or equal the length of the the remaining side.

However, 8 is also a possibility in this example as the point of cashier can be drawn on the straight line along with two dressing rooms. Thus, in this case obviously, triangular rule does not apply....

What i want to stress that if there was an option with figure 8, you should choose it as a correct answer also... All other options, would definetely have to be considered using the triangular rule as there would be no way to put the point that would be equidistant from the other two points....