diff --git a/inc/hgl/math/Area.h b/inc/hgl/math/Area.h
new file mode 100644
index 0000000..bfa8308
--- /dev/null
+++ b/inc/hgl/math/Area.h
@@ -0,0 +1,70 @@
+#pragma once
+
+#include<hgl/math/Vector.h>
+
+namespace hgl
+{
+    /*
+    * 根据三角形的三边长计算三角形的面积
+    */
+    inline const float TriangleArea(const float a,const float b,const float c)
+    {
+        const float s=(a+b+c)*0.5f;
+
+        return sqrt(s*(s-a)*(s-b)*(s-c));
+    }
+
+    inline const float TriangleArea(const Vector2f &a,const Vector2f &b,const Vector2f &c)
+    {
+        return fabs((a.x-c.x)*(b.y-c.y)-(a.y-c.y)*(b.x-c.x))*0.5f;
+    }
+
+    inline const float TriangleArea(const Vector3f &a,const Vector3f &b,const Vector3f &c)
+    {
+        return glm::length(glm::cross(b-a,c-a))*0.5f;
+    }
+
+    inline const float RectangleArea(const float width,const float height)
+    {
+        return width*height;
+    }
+
+    inline const float RectangleArea(const Vector2f &size)
+    {
+        return size.x*size.y;
+    }
+    
+    /**
+     * 正圆面积计算
+     * @param radius 半径
+     */
+    inline const float CircleArea(const float radius)
+    {
+        return HGL_PI*radius*radius;
+    }
+    
+    /**
+     * 椭圆面积计算
+     * @param l_radius 长半径
+     * @param s_radius 短半径
+     */
+    inline const float EllipseArea(const float horizontal_radius,const float vertical_radius)
+    {
+        return HGL_PI*horizontal_radius*vertical_radius;
+    }
+
+    inline const float EllipseArea(const Vector2f &radius)
+    {
+        return HGL_PI*radius.x*radius.y;
+    }
+
+    inline const float SectorArea(const float radius,const float angle)
+    {
+        return HGL_PI*radius*radius*angle/360.0f;
+    }
+
+    inline const float QuadArea(const Vector3f &a,const Vector3f &b,const Vector3f &c,const Vector3f &d)
+    {
+        return TriangleArea(a,b,c)+TriangleArea(a,c,d);
+    }
+}//namespace hgl
diff --git a/inc/hgl/math/Bezier.h b/inc/hgl/math/Bezier.h
new file mode 100644
index 0000000..77566f6
--- /dev/null
+++ b/inc/hgl/math/Bezier.h
@@ -0,0 +1,8 @@
+#pragma once
+
+#include<hgl/math/Vector.h>
+
+namespace hgl
+{
+
+}//namespace hgl
diff --git a/inc/hgl/math/Math.h b/inc/hgl/math/Math.h
index 30fb8b4..f664e93 100644
--- a/inc/hgl/math/Math.h
+++ b/inc/hgl/math/Math.h
@@ -3,6 +3,7 @@
 
 #include<hgl/math/PrimaryMathematics.h>
 #include<hgl/math/FastTriangle.h>
+#include<hgl/math/Area.h>
 #include<hgl/math/Vector.h>        // Game Math and Geometry Library
 #include<hgl/math/Matrix.h>
 
diff --git a/inc/hgl/math/MathConst.h b/inc/hgl/math/MathConst.h
index b9980f6..4eec878 100644
--- a/inc/hgl/math/MathConst.h
+++ b/inc/hgl/math/MathConst.h
@@ -55,7 +55,7 @@ namespace hgl
     constexpr const double HGL_SIN_270=-1;
     constexpr const double HGL_SIN_315=-0.707106781187;
 
-    #define HGL_DEF_DEG2RAD(ang)    constexpr double HGL_RAD_##ang=double(ang)*(HGL_PI/180.0f);
+    #define HGL_DEF_DEG2RAD(ang)    constexpr const double HGL_RAD_##ang=double(ang)*(HGL_PI/180.0f);
 
     HGL_DEF_DEG2RAD(0)
     HGL_DEF_DEG2RAD(45)
@@ -104,25 +104,6 @@ namespace hgl
 
         return double(floor(value*per))/per;
     }
-    
-    /**
-     * 正圆面积计算
-     * @param radius 半径
-     */
-    inline constexpr double CircleArea(const double radius)
-    {
-        return(radius*radius*HGL_PI);
-    }
-
-    /**
-     * 椭圆面积计算
-     * @param l_radius 长半径
-     * @param s_radius 短半径
-     */
-    inline constexpr double ElipseArea(const double l_radius,const double s_radius)
-    {
-        return(l_radius*s_radius*HGL_PI);
-    }
 
     /**
      * 球体积计算
diff --git a/inc/hgl/math/Vector.h b/inc/hgl/math/Vector.h
index d534c29..e445057 100644
--- a/inc/hgl/math/Vector.h
+++ b/inc/hgl/math/Vector.h
@@ -261,19 +261,19 @@ namespace hgl
         return from + (to - from) * alpha;
     }
 
-    inline bool is_nearly_equal(const float v1,const float v2,const float deviation=HGL_FLOAT_SMALL)
+    inline bool is_nearly_equal(const float v1,const float v2,const float deviation=HGL_FLOAT_KINDA_SMALL)
     {
-        return fabsf(v1-v2)<=HGL_FLOAT_SMALL;
+        return fabsf(v1-v2)<=deviation;
     }
 
-    inline bool is_nearly_equal(const Vector2f &v1,const Vector2f &v2,const float deviation=HGL_FLOAT_SMALL)
+    inline bool is_nearly_equal(const Vector2f &v1,const Vector2f &v2,const float deviation=HGL_FLOAT_KINDA_SMALL)
     {
-        return length_squared_2d(v1,v2)<=HGL_FLOAT_SMALL;
+        return length_squared_2d(v1,v2)<=deviation;
     }
 
-    inline bool is_nearly_equal(const Vector3f &v1,const Vector3f &v2,const float deviation=HGL_FLOAT_SMALL)
+    inline bool is_nearly_equal(const Vector3f &v1,const Vector3f &v2,const float deviation=HGL_FLOAT_KINDA_SMALL)
     {
-        return length_squared(v1,v2)<=HGL_FLOAT_SMALL;
+        return length_squared(v1,v2)<=deviation;
     }
 
     /**
@@ -413,5 +413,15 @@ namespace hgl
              &&IsNearlyEqual(a.y,b.y)
              &&IsNearlyEqual(a.z,b.z);
     }
+
+    inline const Vector3f LerpDirection(const Vector3f &center,const Vector3f &from_direction,const Vector3f &to_direction,const float alpha)
+    {
+        return glm::normalize(center + (from_direction - center) * alpha + (to_direction - center) * alpha);
+    }
+
+    inline const Vector3f SLerpDirection(const Vector3f &center,const Vector3f &from,const Vector3f &to,const float alpha)
+    {
+        return glm::normalize(glm::slerp(from - center, to - center, alpha) + center);
+    }
 }//namespace hgl
 #endif//HGL_ALGORITHM_MATH_VECTOR_INCLUDE
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index eeca449..f625404 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -51,6 +51,8 @@ SET(MATH_INCLUDE_PATH   ${CMCORE_ROOT_INCLUDE_PATH}/hgl/math)
 ##Math--------------------------------------------------------
 SET(MATH_HEADER_FILES   ${MATH_INCLUDE_PATH}/bvec.h
                         ${MATH_INCLUDE_PATH}/FastTriangle.h
+                        ${MATH_INCLUDE_PATH}/Bezier.h
+                        ${MATH_INCLUDE_PATH}/Area.h
                         ${MATH_INCLUDE_PATH}/Math.h
                         ${MATH_INCLUDE_PATH}/MathConst.h
                         ${MATH_INCLUDE_PATH}/Matrix.h