Style details

Just suggestions

book/book.tex

@@ -12658,7 +12658,7 @@ \section{Exercises}
 
 Write a definition for a class named {\tt Circle} with attributes
 {\tt center} and {\tt radius}, where {\tt center} is a Point object
-and radius is a number.
+and {\tt radius} is a number.
 
 Instantiate a Circle object that represents a circle with its center
 at $(150, 100)$ and radius 75.
@@ -12673,8 +12673,8 @@ \section{Exercises}
 
 Write a function named \verb"rect_circle_overlap" that takes a Circle
 and a Rectangle and returns True if any of the corners of the Rectangle fall
-inside the circle.  Or as a more challenging version, return True if
-any part of the Rectangle falls inside the circle.
+inside the Circle.  Or as a more challenging version, return True if
+any part of the Rectangle falls inside the Circle.
 
 Solution: \url{http://thinkpython2.com/code/Circle.py}.