16 JUNIOR GRADE SCIENCE 



we substitute its value in terms of the radius as found in Section 3, 

 the rule may be simplified in the following way. 



. , circumference 

 Area of circle = ~ x ra d. 



TT x 2 rad. 

 = ^ xrad - 



= TT x rad. x rad. 

 =TT x rad. 2 



