How to find the arc lengths with only the radiuses?

I'm trying to complete this blueprint and have no idea what are the arc lengths of R1.500 and R8.000. How would I find them?

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You should be able to just pick any arc segment and 'measure' to get it's arc length. This also works with spline curves, it still calls the measurement 'arc length' though.

 
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Click the start point then end point then arc

 
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