Area of Wafer: Pi*r^2 Explained

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The discussion centers on calculating the area of a circular wafer using the formula pi*r^2. A user questions the inclusion of a 1/4 factor in the solution manual, initially assuming the full area formula suffices. They express confusion regarding the concept of usable area versus waste in the context of wafer production. Ultimately, the user realizes that the diameter is double the radius, clarifying their understanding. The conversation highlights the importance of accurately interpreting formulas in geometry.
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Hello guys, I have an upcoming test. When I was doing a question about finding the area of the wafer. it is circular. In the solution manual it says pi*r^2 / 4 . I do not understand where 1/4 comes from. Since it is circular , I assumed the pi*r^2 would be fine.
 
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Usable area? I could see a little waste but not that much.
 
it just says compare the areas of wafers for the gven diameters .
 
nevermind i just found d=2r ;lol sorry
 

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