Finding radius: A,B,C are points on circle with centre O, <AOC = 118*, BA = BC; shaded area is 70 sq cm

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Laia

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Hello. Can someone instruct me the way to solve this ? I only know that I need to find the radius to work out this but I don't know where to start.
 

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Laia said:
Hello. Can someone instruct me the way to solve this ? I only know that I need to find the radius to work out this but I don't know where to start.
Click to expand...
Hello! I think I found the radius so can someone check whether it's correct or not
 

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Laia said:
Hello! I think I found the radius so can someone check whether it's correct or not
Click to expand...
After finding the radius, do I have to find the area of the circle and then subtract the given area. After that, will I get the required area?
 
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