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rPeri(r) srPeri(sr) mrPeri(mr, dlat = 5, dlon = 10) drPeri(dr, dlat = 1, dlon = 2)
mrPeri
drPeri
deg2rect
rectArea
geoarea
geoplot(island, type = "n", grid = FALSE) geolines(rPeri(468)) geolines(srPeri(4681))
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