diff --git a/src/exercises/day-2/points-polygons.rs b/src/exercises/day-2/points-polygons.rs
index 78fd13fb..0d7c1d23 100644
--- a/src/exercises/day-2/points-polygons.rs
+++ b/src/exercises/day-2/points-polygons.rs
@@ -207,6 +207,7 @@ mod tests {
     fn test_shape_circumferences() {
         let mut poly = Polygon::new();
         poly.add_point(Point::new(12, 13));
+        poly.add_point(Point::new(17, 11));
         poly.add_point(Point::new(16, 16));
         let shapes = vec![
             Shape::from(poly),
@@ -217,7 +218,7 @@ mod tests {
             .map(Shape::circumference)
             .map(round_two_digits)
             .collect::<Vec<_>>();
-        assert_eq!(circumferences, vec![10.0, 31.42]);
+        assert_eq!(circumferences, vec![15.48, 31.42]);
     }
 }
 // ANCHOR_END: unit-tests