How to calculate length of arc?

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To calculate the length of an arc for a product design project, knowing the radius and the length of the chord is essential. The user, Brandon, is working on a speaker system design and requires the arc lengths for material ordering. SolidWorks CAD software may have features that allow users to select arcs directly to obtain their lengths. Links to relevant SolidWorks resources were shared to assist in this calculation. The discussion concludes with Brandon confirming that he found the needed information.
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How to calculate length of arc? Please Help!

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.
8389459712_4ef0cbe42c.jpg


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?
 


Thank you Jed! - I thought it must have a feature to do so! - hence why I added that I had used it.

Thank you very much guys, sorted!
 

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