Dov Gutterman reported a construction sheet in the Jalur Gemilang website.
António Martins, 14 September 1999

Since the dimensions given by António Martins were obtained measuring by hand (in a lighter shade of grey in the above image), it could easily be that the distance of the inner circle (defining the crescent) to the hoist should be precisely 6 units (rather than 5 + 11/12 units) which would place it neatly in the hoistmost point of the circle circumscribing the star. If so, the radius of the inner circle is 2.75 (2 ¾), i.e. the diameter is 5.5 which is a not very weird number since it is already used once in the construction sheet explicitly (distance from fly end of canton to center of the star). Željko Heimer, 25 May 2002

Also because it is reasonable to think that:

the circle defining the star has a diameter of 5 units;

the inner circle defining the crescent has a diameter of 5.5 units; and

the outer circle defining the crescent has a diameter of 6 units.