V u u. -i- V V ' ' * 



ex qua colligimus 



-qJ" C) f rtt On H_5 (lue 



* r w -^{^uuvv-i-uuiuiij-i-vviuvi)^ 



cof. Ofcy =: 



y('+^+~i") " ^ yuu + .\, + ~)' 



Sicque innotefcit inclinatio plani u v ii; ad planum A O B, 

 quippe cuius cofinus eft — yj-, ; —y Simili mo- 



^ ' \uu ~ I vv ■+" .iJT^) 



do per analogiam concluditur inclinatio plani u v lu ad 

 planum B O C , cuius cofinus efl; y . . , -7— v ; 



ac denique inclinatio plani u v iv ^^ planum C O A, cu- 



I 



ius coCnus eft „,-,//.. 1 ■■ \ ' 

 ^ <^ \uu-r' vv-r- ^y^ 



§. 7. Cum igitur (it 



j r d q — q d r 



H I 



a — j)d r — r d p -j 



V t 



2 — gdp—Pd q g jj 



1 _, 1 ■ i_ dp^iqq + rr) + dq''[pp-^rr)-{ .d r^(pp-hng) 



UU "I" VV " I lu^y / f 



__ ip q d p d q — 2p r d p d r — zq r d g d r 

 t t > 



quia vero eft 



qq-hf^r-i—ppf pp-i-rr^zzi—qq et 

 pp-i-qq-i~rrt 



Ana Acad, Imp, Sc» Tom. VI P. L F his 



