diff --git a/frontend/src/lib.rs b/frontend/src/lib.rs
index 8a4987c..86240ac 100644
--- a/frontend/src/lib.rs
+++ b/frontend/src/lib.rs
@@ -55,8 +55,8 @@ impl Circle {
             x = x3 - (r.powi(2)-(q/2.0).powi(2)).sqrt() * (y1-y2)/q;
             y = y3 - (r.powi(2)-(q/2.0).powi(2)).sqrt() * (x2-x1)/q;
 
-            a2 = (y - y1).atan2(x - x1);
-            a1 = (y - y2).atan2(x - x2);
+            a1 = (y - y1).atan2(x - x1);
+            a2 = (y - y2).atan2(x - x2);
         }
 
         let distance = q.ceil() as usize + 1;
diff --git a/frontend/www/index.html b/frontend/www/index.html
index 557728d..d9e0aa5 100644
--- a/frontend/www/index.html
+++ b/frontend/www/index.html
@@ -20,7 +20,7 @@
           </div>
           <div>
             <span>Ms per frame:&nbsp;</span>
-            <input type="number" id="speed" value="500">
+            <input type="number" id="speed" value="100">
           </div>
           <div class="slidecontainer">
             <input type="range" min="0" max="1" value="1" class="slider" id="turnSlider">
diff --git a/frontend/www/index.ts b/frontend/www/index.ts
index a4a79d5..f38f8e8 100644
--- a/frontend/www/index.ts
+++ b/frontend/www/index.ts
@@ -51,7 +51,7 @@ const RESOLUTION = [CANVAS.width, CANVAS.height];
 
 const GL = CANVAS.getContext("webgl");
 
-var ms_per_frame = 100;
+var ms_per_frame = parseInt(SPEED.value);
 
 resizeCanvasToDisplaySize(CANVAS);