090 degrees
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It is the angle between the rays from two points to a reference point. For example, if you can see a dog (D) in the background and your friend (F) in front of you, the angle of separation between the dog and your friend, as seen from your eye (E), is the angle DEF. The angle of separation between the same things, from someone else's viewpoint will be different.
A rhombus is a(n) equilateral parallelogram. A square is forming a right angle.
The exterior angle of an n-sided polygon is 360/n degrees. In this case n = 15 so angle is 24o
D=27 E=81 F=72
interior angle of an n-sided polygon = (180(n-2)/n)°interior angle of a 24-sided polygon = (180x22/24)° = 165°