How to remove list item by its type?

Question

C++ / C#

There is an abstract class Shape, and three heirs of Square, Circle, Triangle. Created a List in which some figures will be placed. Faced with the fact that you need to write a method to remove elements from the list by their type. The user types for example: Circle and all elements of type Circle are removed from the list. Tried to click something through LINQ, nothing came of it. I ask for hints!

Answer 1

static class Extensions
{
  public static IEnumerable<TSource> Remove<TSource>(this IEnumerable<TSource> collection, Predicate<TSource> predicate)
  {
    foreach(TSource item in collection)
    {
       if(!predicate?.Invoke(item)) yield return item;
    }		
  }
}

class Program
{
    public static void Main()
    {
        IEnumerable<Shape> shapes = new List<Shape> { new Square(), new Triangle(), new Circle(), new Circle() };
        foreach(var shape in shapes.Remove(t => t.GetType() == typeof(Circle)))
        {
           Console.WriteLine(shape.GetType()); // Square, Triangle
        }
    }
}

Answer 2

list = list.Where(x=>x.GetType() != typeof(Circle)).ToList()