perimeter method Null safety

double perimeter(
  1. List<Point<num>> triangle
)

get perimeter of a triangle

Implementation

static double perimeter(List<Point> triangle) {
  assert(triangle.length == 3);
  final sides = PolygonUtils.getPolygonSides(triangle);

  return sides.fold<double>(0.0, (prev, e) => prev + e.length);
}