diff --git a/a8/collision.cc b/a8/collision.cc
index f5ec8a7..117e1f4 100644
--- a/a8/collision.cc
+++ b/a8/collision.cc
@@ -92,6 +92,29 @@ namespace a8
         return n < t*t;
     }
 
+    bool IntersectSectorCircle(a8::Vec2 a_pos, float angle, float a_rad, a8::Vec2 b_pos, float b_rad)
+    {
+        {
+            a8::Vec2 d = b_pos - a_pos;
+            float n = a8::LengthSqr(d);
+            if (n < a_rad || n < b_rad) {
+                return true;
+            }
+            if (n > a_rad + b_rad) {
+                return false;
+            }
+        }
+        {
+
+        }
+        return false;
+    }
+
+    bool IntersectSectorAabb(a8::Vec2 a_pos, float angle, float a_rad, a8::Vec2 b_min, a8::Vec2 b_max)
+    {
+        return false;
+    }
+
     bool CircleContainCircle(a8::Vec2 a_pos, float a_rad, a8::Vec2 b_pos, float b_rad)
     {
         float distance = (a_pos - b_pos).Norm();
diff --git a/a8/collision.h b/a8/collision.h
index 128119b..ff49d04 100644
--- a/a8/collision.h
+++ b/a8/collision.h
@@ -10,6 +10,8 @@ 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 IntersectCircleCircle(a8::Vec2 a_pos, float a_rad, a8::Vec2 b_pos, float b_rad);
+    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);
     bool CalcCircleAabbSafePoint(a8::Vec2 a_pos, float a_rad, a8::Vec2 b_min, a8::Vec2 b_max,
                                  a8::Vec2& new_pos);