4C| 



GEOMETRY. 



PROBLEM XXIII. 



Q describe a Hect angles or a Paralleiogra?ny of a given 

 Length and BreaJik. 



Place B C perpendicular to 

 A B. "W ith centre A, and rad- 

 ius B C, describe an arc. With 

 centre C, and radius A B, de- 

 scribe another arc cutting the 

 former in D. Draw A D and 

 CD, and it is done. 



Note. In the same manner is described any oblique 

 parallelogram, except in drawing B C so as to make the 

 given oblique angle with A B, instead of a right one. 



PROBLEM XXIV, 

 21? mahe a regular Pent/igon en a given Line A B, 



Make B /;; perpendicular and 

 equal to half AB. Draw A/;/, 

 and produce it till in n be equal 

 to B ;;/. With centres A and y 

 B, and radius B «, describe • \ 

 arcs intersecting in o, which '\ \ 

 will be the centre of the cir- \\ ^^ 

 cumscribing circle. Then with "- -; - -- 

 the centre o, and the same rad- 

 ius, describe the circle -, ancl about the circumference of 

 it spply A B the proper number of times. 



Another 



._J: 



JJ 



