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She is not sure about the size though, and wants to be able to quickly experiment with the drawing by changing only one number - the radius of the bottom dot - and for the rest of the code to size and scale the drawing accordingly. How should she adjust lines 2 and 3 of her code to implement this change?
1. var middle =100/2: var top=50/2
2. var middle =bottom/2; var top=middle/2
3. var middle =100-50; var top=50-25
4. var middle =bottom-50; var top=middle-25

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