1 files changed, 9 insertions, 7 deletions
diff --git a/challenge-123/abigail/ruby/ch-2.rb b/challenge-123/abigail/ruby/ch-2.rb
index 7e7f54b680..56fb532063 100644
--- a/challenge-123/abigail/ruby/ch-2.rb
+++ b/challenge-123/abigail/ruby/ch-2.rb
@@ -8,14 +8,16 @@
 # Run as: ruby ch-2.rb < input-file
 #
 
+def dist (x1, y1, x2, y2)
+    return (x1 - x2) ** 2 + (y1 - y2) ** 2
+end
+
 ARGF . each_line do
     |line|
     x1, y1, x2, y2, x3, y3, x4, y4 = line . split(" ") . map {|n| n . to_i}
-    e1 = (x1 - x2) ** 2 + (y1 - y2) ** 2
-    e2 = (x2 - x3) ** 2 + (y2 - y3) ** 2
-    e3 = (x3 - x4) ** 2 + (y3 - y4) ** 2
-    e4 = (x4 - x1) ** 2 + (y4 - y1) ** 2
-    d1 = (x1 - x3) ** 2 + (y1 - y3) ** 2
-    d2 = (x2 - x4) ** 2 + (y2 - y4) ** 2
-    puts (e1 == e2 && e2 == e3 && e3 == e4 && d1 == d2 ? 1 : 0)
+
+    puts (dist(x1, y1, x2, y2) == dist(x2, y2, x3, y3) &&
+          dist(x2, y2, x3, y3) == dist(x3, y3, x4, y4) &&
+          dist(x3, y3, x4, y4) == dist(x4, y4, x1, y1) &&
+          dist(x1, y1, x3, y3) == dist(x2, y2, x4, y4) ? 1 : 0)
 end