Use existing method. (There's precedence)

src/ImageSharp/Common/Helpers/ImageMaths.cs

@@ -125,19 +125,7 @@ namespace SixLabors.ImageSharp
         /// <paramref name="m"/> should be power of 2.
         /// </summary>
         [MethodImpl(InliningOptions.ShortMethod)]
-        public static int ModuloP2(int x, int m)
-        {
-            return x & (m - 1);
-        }
-
-        /// <summary>
-        /// Converts degrees to radians
-        /// </summary>
-        [MethodImpl(InliningOptions.ShortMethod)]
-        public static float DegreesToRadians(float degrees)
-        {
-            return degrees * ((float)Math.PI / 180f);
-        }
+        public static int ModuloP2(int x, int m) => x & (m - 1);
 
         /// <summary>
         /// Returns the absolute value of a 32-bit signed integer. Uses bit shifting to speed up the operation.

src/ImageSharp/Processing/AffineTransformBuilder.cs

@@ -59,7 +59,7 @@ namespace SixLabors.ImageSharp.Processing
         /// <param name="degrees">The amount of rotation, in degrees.</param>
         /// <returns>The <see cref="AffineTransformBuilder"/>.</returns>
         public AffineTransformBuilder PrependRotationDegrees(float degrees)
-            => this.PrependRotationRadians(ImageMaths.DegreesToRadians(degrees));
+            => this.PrependRotationRadians(MathFExtensions.DegreeToRadian(degrees));
 
         /// <summary>
         /// Appends a rotation matrix using the given rotation angle in degrees
@@ -68,7 +68,7 @@ namespace SixLabors.ImageSharp.Processing
         /// <param name="degrees">The amount of rotation, in degrees.</param>
         /// <returns>The <see cref="AffineTransformBuilder"/>.</returns>
         public AffineTransformBuilder AppendRotationDegrees(float degrees)
-            => this.AppendRotationRadians(ImageMaths.DegreesToRadians(degrees));
+            => this.AppendRotationRadians(MathFExtensions.DegreeToRadian(degrees));
 
         /// <summary>
         /// Prepends a scale matrix from the given uniform scale.

src/ImageSharp/Processing/ProjectiveTransformBuilder.cs

@@ -1,7 +1,6 @@
 // Copyright (c) Six Labors and contributors.
 // Licensed under the Apache License, Version 2.0.
 
-using System;
 using System.Collections.Generic;
 using System.Numerics;
 using SixLabors.ImageSharp.Processing.Processors.Transforms;
@@ -115,7 +114,7 @@ namespace SixLabors.ImageSharp.Processing
         /// <param name="degrees">The amount of rotation, in degrees.</param>
         /// <returns>The <see cref="AffineTransformBuilder"/>.</returns>
         public ProjectiveTransformBuilder PrependCenteredRotationDegrees(float degrees)
-            => this.PrependRotationRadians(ImageMaths.DegreesToRadians(degrees));
+            => this.PrependRotationRadians(MathFExtensions.DegreeToRadian(degrees));
 
         /// <summary>
         /// Appends a centered rotation matrix using the given rotation in degrees.
@@ -123,7 +122,7 @@ namespace SixLabors.ImageSharp.Processing
         /// <param name="degrees">The amount of rotation, in degrees.</param>
         /// <returns>The <see cref="AffineTransformBuilder"/>.</returns>
         public ProjectiveTransformBuilder AppendRotationDegrees(float degrees)
-            => this.AppendRotationRadians(ImageMaths.DegreesToRadians(degrees));
+            => this.AppendRotationRadians(MathFExtensions.DegreeToRadian(degrees));
 
         /// <summary>
         /// Prepends a scale matrix from the given uniform scale.