ASOE Physics Exam Q - Diagram for Constructive Interference

[TEKNO]

1. The problem statement, all variables, and given/known data

So I am studying for the ASOE physics test. I came across the following question where I can't really understand the answer to it:

Graham’s radio has 2 speakers, separated by a distance d. Draw a diagram showing where there will be constructive interference between the sound from the two speakers when it is playing. Make sure you label your diagram carefully. Consider only the interference pattern in the air.

The actual answer is: http://prntscr.com/fum35c

Could someone help me and explain what they are talking about? Is this just a different format of drawing to the same point.

Homework Equations

Constructive Interference?

The Attempt at a Solution

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I drew something like this: http://prntscr.com/fum2ha

 

[Doc Al]

Those are two different versions of the same idea. Note that the question just wants you to show the points of constructive interference, not the full interference pattern.

You might want to read this: Two Point Source Interference