398 



GEOMETRY. 



apply th&in from m to ??. Througli the point ;; draw 

 A «, and it will make the angle A of thf number of de- 

 grees proposed. 



Or the angle rriT^y he made with any divided arc, or in« 

 strument, by applying the centre to tlie point A, and iti 

 radius along A B -, tlien make a mark « at the proposed 

 number of degrees, tlirough ^yhicIl draw the. line A r^., as 

 before. 



Note. Angles of more than oo degrees are usually- 

 taken off at twice. 



PRO B L E M X I^ 

 ^0 t?:easurg a given Angle A. 



Describe the arc inn with 

 the chord of 60 degrees, as 

 in the last Problem. Take 

 the arc ni n in the compasseS;, 

 and that extent, applied to 

 the chords, will shew the 

 degrees in the given angle. 



PROBLEM XIF, 



To find the Centre of a Cirtk. 



Draw any chord A B ; and bisect 

 it perpendicularly with C D, which 

 will be a diameter. Bisect C D in 



the point o, 

 trv% 



which will be the cen,- 



J\ 



PROBLEM 



