PROBLEMS. 09 f 



Another Method. 



From .nny plane scale of equal 

 parts, set oft Am equal to 4 parts. ! 



With centre A, and radius of ^ 1 



three parts, describe an arc. And <''T: "v 



with centre w, and radius of 5 'I * 



parts cross it at n. Draw A;; for 3"" j^j]^ ~ — - 



the perpendicvilar required. 



Or any other numbers in the same proportion, as 3, 4, 

 5, will answer the s^me purpose. 



PROBLEM VI. 



From a g'weti Point A, cut of a given Line BC, to let fall a 

 Pei-pendicular» 



Cas^ l.-^lVhm the point is iiearl^^ opposite the middle of 

 the Line, 



With the centre A, and any rad- -A, 



lus, describe an arc cutting B C in 1 



VI and //. With the centres m and j 



«, and the same, or any other rad- t?^v___ j l> ^^ 



ius, describe arcs intersecting in r. ^^^""••••••1 "'ST 



Draw A D r for the perpendicular T 



required, "J * 



"■'-»'■' 



Case %~Whcn the Point is marly opposite the end cf the 



Line, 



From A draw any line A w to a 



meet B C, in any point m. Bi- 

 sect Am zt ;;, and with the cen- ^< 

 tre «, and radius An or mn, de- ^/i 

 •scribe an arc, cutting BC in D. 

 Draw AD, the perpendicular re- ig / // 

 quired. '-*'^' - 



