diff --git a/day9/1.py b/day9/1.py
new file mode 100644
index 0000000..ee57ad4
--- /dev/null
+++ b/day9/1.py
@@ -0,0 +1,14 @@
+with open(r'day9/input.txt', 'r') as input:
+    lines = list(map(lambda x: list(map(lambda y: int(y),x.split(','))),input.read().split('\n')[:-1]))
+
+def surface(a,b):
+    return (abs(a[0]-b[0])+1)*(abs(a[1]-b[1])+1)
+
+best = surface(lines[0],lines[1])
+
+for i in range(len(lines)):
+    for j in range(i):
+        best = max(best,surface(lines[i],lines[j]))
+
+print(best)
+
diff --git a/day9/2.py b/day9/2.py
new file mode 100644
index 0000000..853a8eb
--- /dev/null
+++ b/day9/2.py
@@ -0,0 +1,55 @@
+with open(r'day9/input.txt', 'r') as input:
+    lines = list(map(lambda x: list(map(lambda y: int(y),x.split(','))),input.read().split('\n')[:-1]))
+
+def surface(a,b):
+    return (abs(a[0]-b[0])+1)*(abs(a[1]-b[1])+1)
+
+inner = set()
+
+for i in range(len(lines)):
+    j = (i+1)%len(lines)
+    if lines[i][0] == lines[j][0]:
+        sign = 1 if lines[i][1] <= lines[j][1] else -1
+        for x in range(lines[i][1],lines[j][1],sign):
+            inner.add((lines[i][0],x))
+    else: 
+        sign = 1 if lines[i][0] <= lines[j][0] else -1
+        for x in range(lines[i][0],lines[j][0],sign):
+            inner.add((x,lines[i][1]))
+
+if lines[0][0] == lines[1][0]:
+    init = (lines[0][0]-1,lines[0][1]+1)
+else:
+    init = (lines[0][0]+1,lines[0][1]+1)
+
+print(init)
+
+L=[init]
+neigh = [[-1,0],[-1,-1],[0,-1],[1,0],[0,1],[1,1],[-1,1],[1,-1]]
+while len(L):
+    sommet = L.pop(0)
+    if sommet not in inner:
+        inner.add(sommet)
+        for nei in neigh:
+            new = (sommet[0]+nei[0],sommet[1]+nei[1])
+            if new not in inner and new not in L:
+                L.append(new)
+
+print("init done")
+
+def is_inside(a,b):
+    for i in range(min(a[0],b[0]),max(a[0],b[0])+1):
+        for j in range(min(a[1],b[1]),max(a[1],b[1])+1):
+            if (i,j) not in inner:
+                return False
+    return True
+
+best = surface(lines[0],lines[1])
+
+for i in range(len(lines)):
+    for j in range(i):
+        if is_inside(lines[i],lines[j]):
+            best = max(best,surface(lines[i],lines[j]))
+
+print(best)
+
diff --git a/day9/input.txt b/day9/input.txt
new file mode 100644
index 0000000..6de9a66
--- /dev/null
+++ b/day9/input.txt
@@ -0,0 +1,496 @@
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