diff --git a/X10D.Tests/src/Drawing/EllipseFTests.cs b/X10D.Tests/src/Drawing/EllipseFTests.cs
index 78a7514..750e900 100644
--- a/X10D.Tests/src/Drawing/EllipseFTests.cs
+++ b/X10D.Tests/src/Drawing/EllipseFTests.cs
@@ -1,4 +1,6 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Drawing;
+using System.Numerics;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
@@ -20,6 +22,26 @@ public class EllipseFTests
         Assert.AreEqual(2 * MathF.PI, unitEllipse.ApproximateCircumference, 1e-6f);
     }
 
+    [TestMethod]
+    public void Constructor_ShouldGiveCorrectEllipse()
+    {
+        var ellipse = new EllipseF(PointF.Empty, new SizeF(2, 1));
+        Assert.AreEqual(new PointF(0, 0), ellipse.Center);
+        Assert.AreEqual(new SizeF(2, 1), ellipse.Radius);
+
+        ellipse = new EllipseF(0, 0, 2, 1);
+        Assert.AreEqual(new PointF(0, 0), ellipse.Center);
+        Assert.AreEqual(new SizeF(2, 1), ellipse.Radius);
+        
+        ellipse = new EllipseF(PointF.Empty, new Vector2(2, 1));
+        Assert.AreEqual(new PointF(0, 0), ellipse.Center);
+        Assert.AreEqual(new SizeF(2, 1), ellipse.Radius);
+        
+        ellipse = new EllipseF(Vector2.Zero, new Vector2(2, 1));
+        Assert.AreEqual(new PointF(0, 0), ellipse.Center);
+        Assert.AreEqual(new SizeF(2, 1), ellipse.Radius);
+    }
+
     [TestMethod]
     public void Equals_ShouldBeTrue_GivenTwoUnitEllipses()
     {
diff --git a/X10D.Tests/src/Drawing/EllipseTests.cs b/X10D.Tests/src/Drawing/EllipseTests.cs
index 0c62cdc..4ee2132 100644
--- a/X10D.Tests/src/Drawing/EllipseTests.cs
+++ b/X10D.Tests/src/Drawing/EllipseTests.cs
@@ -1,4 +1,5 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Drawing;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
@@ -20,6 +21,18 @@ public class EllipseTests
         Assert.AreEqual(2 * MathF.PI, unitEllipse.ApproximateCircumference, 1e-6f);
     }
 
+    [TestMethod]
+    public void Constructor_ShouldGiveCorrectEllipse()
+    {
+        var ellipse = new Ellipse(Point.Empty, new Size(2, 1));
+        Assert.AreEqual(new Point(0, 0), ellipse.Center);
+        Assert.AreEqual(new Size(2, 1), ellipse.Radius);
+        
+        ellipse = new Ellipse(0, 0, 2, 1);
+        Assert.AreEqual(new Point(0, 0), ellipse.Center);
+        Assert.AreEqual(new Size(2, 1), ellipse.Radius);
+    }
+
     [TestMethod]
     public void Equals_ShouldBeTrue_GivenTwoUnitEllipses()
     {
diff --git a/X10D.Unity/src/Numerics/Vector3IntExtensions.cs b/X10D.Unity/src/Numerics/Vector3IntExtensions.cs
index 48697aa..863068c 100644
--- a/X10D.Unity/src/Numerics/Vector3IntExtensions.cs
+++ b/X10D.Unity/src/Numerics/Vector3IntExtensions.cs
@@ -1,5 +1,4 @@
 using System.Diagnostics.Contracts;
-using System.Drawing;
 using System.Runtime.CompilerServices;
 using UnityEngine;
 
diff --git a/X10D/src/Drawing/Ellipse.cs b/X10D/src/Drawing/Ellipse.cs
index 950265a..911ea58 100644
--- a/X10D/src/Drawing/Ellipse.cs
+++ b/X10D/src/Drawing/Ellipse.cs
@@ -15,24 +15,30 @@ public readonly struct Ellipse : IEquatable<Ellipse>
     /// <summary>
     ///     The unit ellipse. That is, an ellipse whose center point is (0, 0) and whose two radii are 1.
     /// </summary>
-    public static readonly Ellipse Unit = new(Point.Empty, 1, 1);
+    public static readonly Ellipse Unit = new(0, 0, 1, 1);
+
+    /// <summary>
+    ///     Initializes a new instance of the <see cref="Ellipse" /> struct.
+    /// </summary>
+    /// <param name="centerX">The X coordinate of the center point.</param>
+    /// <param name="centerY">The Y coordinate of the center point.</param>
+    /// <param name="horizontalRadius">The horizontal radius of the ellipse.</param>
+    /// <param name="verticalRadius">The vertical radius of the ellipse.</param>
+    public Ellipse(int centerX, int centerY, int horizontalRadius, int verticalRadius)
+        : this(new Point(centerX, centerY), new Size(horizontalRadius, verticalRadius))
+    {
+    }
 
     /// <summary>
     ///     Initializes a new instance of the <see cref="Ellipse" /> struct.
     /// </summary>
     /// <param name="center">The center point of the ellipse.</param>
-    /// <param name="horizontalRadius">The horizontal radius of the ellipse.</param>
-    /// <param name="verticalRadius">The vertical radius of the ellipse.</param>
-    public Ellipse(Point center, int horizontalRadius, int verticalRadius)
+    /// <param name="radius">The radius of the ellipse.</param>
+    public Ellipse(Point center, Size radius)
     {
         Center = center;
-        HorizontalRadius = horizontalRadius;
-        VerticalRadius = verticalRadius;
-    }
-
-    public static implicit operator Ellipse(Circle circle)
-    {
-        return new Ellipse(circle.Center, circle.Radius, circle.Radius);
+        HorizontalRadius = radius.Width;
+        VerticalRadius = radius.Height;
     }
 
     /// <summary>
@@ -77,6 +83,15 @@ public readonly struct Ellipse : IEquatable<Ellipse>
     /// <value>The horizontal radius.</value>
     public int HorizontalRadius { get; }
 
+    /// <summary>
+    ///     Gets the radius of the ellipse.
+    /// </summary>
+    /// <value>The radius.</value>
+    public Size Radius
+    {
+        get => new(HorizontalRadius, VerticalRadius);
+    }
+
     /// <summary>
     ///     Gets the vertical radius of the ellipse.
     /// </summary>
@@ -111,6 +126,16 @@ public readonly struct Ellipse : IEquatable<Ellipse>
         return !left.Equals(right);
     }
 
+    /// <summary>
+    ///     Implicitly converts a <see cref="Circle" /> to an <see cref="Ellipse" />.
+    /// </summary>
+    /// <param name="circle">The circle to convert.</param>
+    /// <returns>The converted ellipse.</returns>
+    public static implicit operator Ellipse(Circle circle)
+    {
+        return new Ellipse(circle.Center, new Size(circle.Radius, circle.Radius));
+    }
+
     /// <inheritdoc />
     public override bool Equals(object? obj)
     {
diff --git a/X10D/src/Drawing/EllipseF.cs b/X10D/src/Drawing/EllipseF.cs
index c07cd2d..d3a9d2d 100644
--- a/X10D/src/Drawing/EllipseF.cs
+++ b/X10D/src/Drawing/EllipseF.cs
@@ -1,4 +1,6 @@
 using System.Drawing;
+using System.Numerics;
+using X10D.Numerics;
 
 namespace X10D.Drawing;
 
@@ -15,21 +17,58 @@ public readonly struct EllipseF : IEquatable<EllipseF>
     /// <summary>
     ///     The unit ellipse. That is, an ellipse whose center point is (0, 0) and whose two radii are 1.
     /// </summary>
-    public static readonly EllipseF Unit = new(PointF.Empty, 1.0f, 1.0f);
+    public static readonly EllipseF Unit = new(0.0f, 0.0f, 1.0f, 1.0f);
 
     /// <summary>
     ///     Initializes a new instance of the <see cref="EllipseF" /> struct.
     /// </summary>
-    /// <param name="center">The center point of the ellipse.</param>
+    /// <param name="centerX">The X coordinate of the center point.</param>
+    /// <param name="centerY">The Y coordinate of the center point.</param>
     /// <param name="horizontalRadius">The horizontal radius of the ellipse.</param>
     /// <param name="verticalRadius">The vertical radius of the ellipse.</param>
-    public EllipseF(PointF center, float horizontalRadius, float verticalRadius)
+    public EllipseF(float centerX, float centerY, float horizontalRadius, float verticalRadius)
     {
-        Center = center;
+        Center = new PointF(centerX, centerY);
         HorizontalRadius = horizontalRadius;
         VerticalRadius = verticalRadius;
     }
 
+    /// <summary>
+    ///     Initializes a new instance of the <see cref="Ellipse" /> struct.
+    /// </summary>
+    /// <param name="center">The center point of the ellipse.</param>
+    /// <param name="radius">The radius of the ellipse.</param>
+    public EllipseF(PointF center, SizeF radius)
+    {
+        Center = center;
+        HorizontalRadius = radius.Width;
+        VerticalRadius = radius.Height;
+    }
+
+    /// <summary>
+    ///     Initializes a new instance of the <see cref="Ellipse" /> struct.
+    /// </summary>
+    /// <param name="center">The center point of the ellipse.</param>
+    /// <param name="radius">The radius of the ellipse.</param>
+    public EllipseF(PointF center, Vector2 radius)
+    {
+        Center = center;
+        HorizontalRadius = radius.X;
+        VerticalRadius = radius.Y;
+    }
+
+    /// <summary>
+    ///     Initializes a new instance of the <see cref="Ellipse" /> struct.
+    /// </summary>
+    /// <param name="center">The center point of the ellipse.</param>
+    /// <param name="radius">The radius of the ellipse.</param>
+    public EllipseF(Vector2 center, Vector2 radius)
+    {
+        Center = center.ToPointF();
+        HorizontalRadius = radius.X;
+        VerticalRadius = radius.Y;
+    }
+
     /// <summary>
     ///     Gets the area of the ellipse.
     /// </summary>
@@ -72,6 +111,15 @@ public readonly struct EllipseF : IEquatable<EllipseF>
     /// <value>The horizontal radius.</value>
     public float HorizontalRadius { get; }
 
+    /// <summary>
+    ///     Gets the radius of the ellipse.
+    /// </summary>
+    /// <value>The radius.</value>
+    public SizeF Radius
+    {
+        get => new(HorizontalRadius, VerticalRadius);
+    }
+
     /// <summary>
     ///     Gets the vertical radius of the ellipse.
     /// </summary>
@@ -113,7 +161,7 @@ public readonly struct EllipseF : IEquatable<EllipseF>
     /// <returns>The converted ellipse.</returns>
     public static implicit operator EllipseF(Circle circle)
     {
-        return new EllipseF(circle.Center, circle.Radius, circle.Radius);
+        return new EllipseF(circle.Center, new SizeF(circle.Radius, circle.Radius));
     }
 
     /// <summary>
@@ -123,7 +171,7 @@ public readonly struct EllipseF : IEquatable<EllipseF>
     /// <returns>The converted ellipse.</returns>
     public static implicit operator EllipseF(CircleF circle)
     {
-        return new EllipseF(circle.Center, circle.Radius, circle.Radius);
+        return new EllipseF(circle.Center, new SizeF(circle.Radius, circle.Radius));
     }
 
     /// <summary>
@@ -133,7 +181,7 @@ public readonly struct EllipseF : IEquatable<EllipseF>
     /// <returns>The converted ellipse.</returns>
     public static implicit operator EllipseF(Ellipse ellipse)
     {
-        return new EllipseF(ellipse.Center, ellipse.HorizontalRadius, ellipse.VerticalRadius);
+        return new EllipseF(ellipse.Center, ellipse.Radius);
     }
 
     /// <summary>
@@ -144,7 +192,7 @@ public readonly struct EllipseF : IEquatable<EllipseF>
     public static explicit operator Ellipse(EllipseF ellipse)
     {
         PointF center = ellipse.Center;
-        return new Ellipse(new Point((int)center.X, (int)center.Y), (int)ellipse.HorizontalRadius, (int)ellipse.VerticalRadius);
+        return new Ellipse((int)center.X, (int)center.Y, (int)ellipse.HorizontalRadius, (int)ellipse.VerticalRadius);
     }
 
     /// <inheritdoc />