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word problem dont know were to start

Hi, I am really stuck on this question ,

**fig.19.2 shows a template whose area is 50 square centimetres. find the total length of the template. **

I have drawn the image on paint and have attached it, but its not a very good drawing. sorry if it does not make much sense to you!

I would be able to work this out if it was just the square but because there’s also this semi-circle shape attached to the square i don't really know how to calculate the length of it.