CIRCULAR OR ANGULAR MEASURE. 



This Measure is used to measure angles or the arcs of 

 circles. It is used in astronomy, geography, navigation, 

 and surveying, and for calculating differences of time. 



60 seconds (") make 

 60 minutes " 

 30 degrees " 



90 degrees 



TABLE. 



1 minute, 

 1 degree, 

 1 sign, 



j 1 quadrant, 



llri 



marked ' 



I 



right angle, 

 j circumference 



sig. 

 quad, 

 r. a. 



cir. 



4: quadrants or 

 12 signs " ) \ or circle 



NOTES. 1. The greatest dis- 

 tance across a circle is called 

 its diameter. The distance . , 

 around it is called its circum- R*i 

 ference. Any part of the cir- H 

 cumference is called an arc. "Q 



2. If any circumference, 

 whether large or small, be di- 

 vided into 360 equal arcs, each arc is called a degree. The 



