$f = RGeo::Geographic.spherical_factory
wkt = RGeo::Shapefile::Reader.open("fenced_in_area_4326.shp")[0].as_text
$fenced_in_area = $f.parse_wkt(wkt)

def within_fenced_area(lat, lng)
  pt = $f.point(lng, lat)
  $fenced_in_area.contains?(pt) ? true : false
end