First of all, Hi, I'm Brandon! :) 18 Years old currently doing A Levels - Uni End of this year!

(Not Homework - Coursework!)
So I have this design of a speaker system for my Product Design course in A-Level.
There are 3 arcs in my design that I need to know the length of for when my school orders the materials to my specific measurements.

Here is a picture with measurements of my design from SolidWorks CAD Software.

The arc at the top is 100mm high and the side arcs would be 50mm
All measurements in mm. I hope this is enough info for you to help me!
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 So you know the radius of a circular arc and you know the length of a chord of that arc. Can you draw a right triangle anywhere?
 does solidworks cad have a function to tell you the length by selecting the arcs of interest? THis link seems to imply that: http://grabcad.com/questions/how-to-...dworks-drawing and here at solidworks cad site: https://forum.solidworks.com/thread/60322