You get a string that can fit around the bowl and wrap the string around it and mark where they overlap. measure the string and there is the circumfrence!
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If the lake is a perfect circle the circumference would be 2 pi r, or 2,224.25 feet. Lakes aren't perfect circles so the circumference is probably much larger.
A bowl has no vertex. An ordinary bowl has 5 faces and four edges. The five faces are: inside and outside of the base, inside and outside of the bowl, and the surface of the lip (a very thin circular band). The four edges are where the inside and outside of the curved side meet the base and the lip.
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