a lot of shapes do if you think about it. a triangle(right triangle) A square and rectangles
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90 degrees. At this time the small hand will be at the 9 with a bearing of 270 and the large will be at the 12 with a bearing of 0. The difference between these is 270 degress or 90 degrees but as 90 degrees is smaller that is the one we use.
A vector of 13 acting on O at an angle of 60 degrees.
30 degrees
l M l l Q____l____ N lO l l l P Let MP & NQ be lines intersecting at O. Then angle MON + angle NOP = 180 degrees (linear pair) Angle MOQ + angle QOP = 180 degrees (linear pair) Adding the equations, Angle MON + Angle NOP + Angle MOQ + Angle QOP = 180 + 180 degrees = 360 degrees. Therefore all angles around O sum upto 360 degrees.
If it's a parallelogram then the other 3 angles are 75, 105 and 105 degrees