diff --git a/a8/collision.cc b/a8/collision.cc
index 7341d15..80cd40c 100644
--- a/a8/collision.cc
+++ b/a8/collision.cc
@@ -183,6 +183,32 @@ namespace a8
         return false;
     }
 
+    bool IntersectAabbArc(a8::Vec2 a_min, a8::Vec2 a_max, a8::Vec2 b_pos, float width)
+    {
+        return false;
+    }
+
+    bool IntersectCircleArc(a8::Vec2 a_pos,
+                            float a_rad,
+                            a8::Vec2 b_pos,
+                            float b_rad,
+                            float b_angle,
+                            float b_width,
+                            float b_height)
+    {
+        float distance = b_pos.Distance(a_pos);
+        float _min = b_rad - b_height / 2 - a_rad;
+        float _max = b_rad + b_height / 2 + a_rad;
+        if (distance < _min) {
+            return false;
+        }
+        if (distance > _max) {
+            return false;
+        }
+        float angle = (a_pos - b_pos).CalcAngleEx(a8::Vec2::UP);
+        return false;
+    }
+
     bool IntersectCircleCircle(a8::Vec2 a_pos, float a_rad, a8::Vec2 b_pos, float b_rad)
     {
         float t = a_rad + b_rad;
diff --git a/a8/collision.h b/a8/collision.h
index e43ca69..127c9c4 100644
--- a/a8/collision.h
+++ b/a8/collision.h
@@ -10,7 +10,20 @@ namespace a8
     bool IntersectAabbCircle(a8::Vec2 a_min, a8::Vec2 a_max, a8::Vec2 b_pos, float b_rad);
     bool IntersectAabbAabb(a8::Vec2 a_min, a8::Vec2 a_max, a8::Vec2 b_min, a8::Vec2 b_max);
     bool IntersectAabbObb(a8::Vec2 a_min, a8::Vec2 a_max, a8::Vec2 b_pos, float rotate);
+    bool IntersectAabbArc(a8::Vec2 a_min,
+                          a8::Vec2 a_max,
+                          a8::Vec2 b_pos,
+                          float b_rad,
+                          float b_width,
+                          float b_height);
     bool IntersectCircleCircle(a8::Vec2 a_pos, float a_rad, a8::Vec2 b_pos, float b_rad);
+    bool IntersectCircleArc(a8::Vec2 a_pos,
+                            float a_rad,
+                            a8::Vec2 b_pos,
+                            float b_rad,
+                            float b_angle,
+                            float b_width,
+                            float b_height);
     bool IntersectSectorCircle(a8::Vec2 a_pos, float angle, float a_rad, a8::Vec2 b_pos, float b_rad);
     bool IntersectSectorAabb(a8::Vec2 a_pos, float angle, float a_rad, a8::Vec2 b_min, a8::Vec2 b_max);
     bool CircleContainCircle(a8::Vec2 a_pos, float a_rad, a8::Vec2 b_pos, float b_rad);