why are the dimensions incorrect

[jsinicro]

I will let this image speak

[hamid.sh.]

What is incorrect?

[jsinicro]

shouldn't the difference be 10 mm 35-25 = 10

[jsinicro]

and not 5mm

[jsinicro]

why is the difference between the 2 circles 5 mm

[hamid.sh.]

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@jsinicro wrote:

why is the difference between the 2 circles 5 mm

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Because it is diameter! From your first picture: (35 - 25.3) / 2 = 4.85 mm which is correct. Same goes for other pictures: (35.3 - 25.3) / 2 = 5 mm.

[jsinicro]

OK, so I forgot my geometry? 

[jsinicro]

wow, its been a while, nice. thankyou for keeping me sane.

[hamid.sh.]

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@jsinicro wrote:

OK, so I forgot my geometry? 

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No, I guess it's a confusion about measure tool; it is not measuring difference but DISTANCE between two entities which are concentric circles in this case and thus their distance is equal to R2 - R1 (not D2 - D1).

[jsinicro]

OK,  I guess its all relative of the origin, thankyou from bringing me back

[jsinicro]

origin being the center

[hamid.sh.]

OK,  I guess its all relative of the origin,

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It's not about origin. What would you measure the distance between these two circles if you had a measuring tape? Fusion's measuring tool works the same way.