diff --git a/kkkk.pdf b/kkkk.pdf
index f999f23..a90a932 100644
Binary files a/kkkk.pdf and b/kkkk.pdf differ
diff --git a/kkkk.tex b/kkkk.tex
index e3f478d..0d09c33 100644
--- a/kkkk.tex
+++ b/kkkk.tex
@@ -1,6 +1,6 @@
 \documentclass[twoside,12pt,a4paper,english]{book}
 
-% \includeonly{luku27}
+%\includeonly{luku29}
 
 \usepackage[english]{babel}
 \usepackage[utf8]{inputenc}
@@ -102,8 +102,8 @@
 \include{luku25}
 \include{luku26}
 \include{luku27}
-% \include{luku28}
-% \include{luku29}
+\include{luku28}
+\include{luku29}
 % \include{luku30}
 % \include{kirj}
 
diff --git a/luku29.tex b/luku29.tex
index 3484384..2071b86 100644
--- a/luku29.tex
+++ b/luku29.tex
@@ -494,7 +494,7 @@ Correspondingly, the rays from $b$
 touch 0 and 2 times the border of the polygon,
 so $b$ is outside the polygon.
 
-\section{Polygon are}
+\section{Polygon area}
 
 A general formula for calculating the area
 of a polygon is