diff --git a/src/CuteUtils/FluentMath/Shapes/Circle.cs b/src/CuteUtils/FluentMath/Shapes/Circle.cs
new file mode 100644
index 0000000..bb9d3c3
--- /dev/null
+++ b/src/CuteUtils/FluentMath/Shapes/Circle.cs
@@ -0,0 +1,12 @@
+namespace CuteUtils.FluentMath.Shapes;
+
+public class Circle(double radius)
+{
+    public double Radius { get; set; } = radius;
+
+    public double Diameter => Radius * 2;
+
+    public double Circumference => 2 * Math.PI * Radius;
+
+    public double Area => Math.PI * Math.Pow(Radius, 2);
+}
\ No newline at end of file
diff --git a/src/CuteUtils/FluentMath/Shapes/Ellipse.cs b/src/CuteUtils/FluentMath/Shapes/Ellipse.cs
new file mode 100644
index 0000000..e4963ab
--- /dev/null
+++ b/src/CuteUtils/FluentMath/Shapes/Ellipse.cs
@@ -0,0 +1,12 @@
+namespace CuteUtils.FluentMath.Shapes;
+
+public class Ellipse(double majorAxis, double minorAxis)
+{
+    public double MajorAxis { get; set; } = majorAxis;
+    public double MinorAxis { get; set; } = minorAxis;
+
+    public double Area => Math.PI * MajorAxis * MinorAxis;
+    public double Circumference => Math.PI * ((3 * (MajorAxis + MinorAxis)) - Math.Sqrt(((3 * MajorAxis) + MinorAxis) * (MajorAxis + (3 * MinorAxis))));
+
+    public bool IsCircle => MajorAxis == MinorAxis;
+}
\ No newline at end of file
diff --git a/src/CuteUtils/FluentMath/Shapes/Rectangle.cs b/src/CuteUtils/FluentMath/Shapes/Rectangle.cs
index 424424b..d67a204 100644
--- a/src/CuteUtils/FluentMath/Shapes/Rectangle.cs
+++ b/src/CuteUtils/FluentMath/Shapes/Rectangle.cs
@@ -3,17 +3,22 @@
 /// <summary>
 /// Represents a rectangle
 /// </summary>
-public class Rectangle
+/// <remarks>
+/// Creates a new rectangle instance
+/// </remarks>
+/// <param name="length">The length of the rectangle</param>
+/// <param name="width">The width of the rectangle</param>
+public class Rectangle(double length, double width)
 {
     /// <summary>
     /// The length of the <see cref="Rectangle"/>
     /// </summary>
-    public double Length { get; set; }
+    public double Length { get; set; } = length;
 
     /// <summary>
     /// The width of the <see cref="Rectangle"/>
     /// </summary>
-    public double Width { get; set; }
+    public double Width { get; set; } = width;
 
     /// <summary>
     /// The diagonal of the <see cref="Rectangle"/>
@@ -28,16 +33,10 @@ public class Rectangle
     /// <summary>
     /// The perimeter of the <see cref="Rectangle"/>
     /// </summary>
-    public double Perimeter => Length * 2 + Width * 2;
+    public double Perimeter => (Length * 2) + (Width * 2);
 
-    /// <summary>
-    /// Creates a new rectangle instance
-    /// </summary>
-    /// <param name="length">The length of the rectangle</param>
-    /// <param name="width">The width of the rectangle</param>
-    public Rectangle(double length, double width)
-    {
-        Length = length;
-        Width = width;
-    }
+    public bool IsSquare => Length == Width;
+    public bool IsRectangle => !IsSquare;
+
+    public bool IsGolden => Length / Width == 1.61803398875;
 }
\ No newline at end of file
diff --git a/src/CuteUtils/FluentMath/Shapes/Triangle.cs b/src/CuteUtils/FluentMath/Shapes/Triangle.cs
new file mode 100644
index 0000000..4a25927
--- /dev/null
+++ b/src/CuteUtils/FluentMath/Shapes/Triangle.cs
@@ -0,0 +1,35 @@
+namespace CuteUtils.FluentMath.Shapes;
+
+public class Triangle(double sideA, double sideB, double sideC)
+{
+    public double SideA { get; set; } = sideA;
+    public double SideB { get; set; } = sideB;
+    public double SideC { get; set; } = sideC;
+
+    public double Area
+    {
+        get
+        {
+            double s = (SideA + SideB + SideC) / 2;
+            return Math.Sqrt(s * (s - SideA) * (s - SideB) * (s - SideC));
+        }
+    }
+
+    public double Perimeter => SideA + SideB + SideC;
+
+    public bool IsRightAngled
+    {
+        get
+        {
+            double[] sides = [SideA, SideB, SideC];
+            Array.Sort(sides);
+            return Math.Pow(sides[0], 2) + Math.Pow(sides[1], 2) == Math.Pow(sides[2], 2);
+        }
+    }
+
+    public bool IsEquilateral => SideA == SideB && SideB == SideC;
+
+    public bool IsIsosceles => SideA == SideB || SideB == SideC || SideA == SideC;
+
+    public bool IsScalene => !IsEquilateral && !IsIsosceles;
+}
\ No newline at end of file