Considering the circumference of a circle, it is found that Eric has walked 151.68 km.
The missing information is that the lake is a circle of radius 5 miles.
The circumference of a circle of radius r is given by:
C = 2πr.
Hence the circumference in miles of the circle is:
C = 2π x 5 = 10π miles.
This is the length of one lap, hence the length of 3 laps is:
3 x 10π = 30π miles.
In kilometers, the distance is:
30π x 1.60934 = 151.68 km.
Hence Eric has walked 151.68 km.
More can be learned about the circumference of a circle at https://brainly.com/question/20489969
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