diff --git a/src/components/Roof2.jsx b/src/components/Roof2.jsx
index a4b80b6f..270e4fda 100644
--- a/src/components/Roof2.jsx
+++ b/src/components/Roof2.jsx
@@ -169,7 +169,7 @@ export default function Roof2() {
     ]
     if (canvas) {
       const polygon = new QPolygon(
-        type4,
+        type2,
         {
           fill: 'transparent',
           stroke: 'black',
diff --git a/src/components/fabric/QPolygon.js b/src/components/fabric/QPolygon.js
index 7310456e..2f1842ed 100644
--- a/src/components/fabric/QPolygon.js
+++ b/src/components/fabric/QPolygon.js
@@ -735,6 +735,7 @@ export default class QPolygon extends fabric.Group {
         stroke: 'black',
         strokeWidth: 1,
       },
+      Math.abs(realLine1.length - realLine3.length),
     )
 
     this.addWithUpdate(realLine1)