





16. Show that the mm of tl. abnormal for any 



point .... the parabola jr*=4/>x, equal* one half the length of focal chord 

 to the oom poadini lanfMt 



how thai aa the aUcba in the parabola f = 4fu incrtawa 

 to oo, toe absolute ralue of the slope of the tangent chaitgM from 

 oo to 0; beoo the curve I* concave to* an I iu a 



138. Some properties of the parabola which involve tangents 

 and normals. 1 tin- I'.M-US. A tin- rert 



} 1 . 1 ft 



1 7/7)thr dii f the parabola whose eqi 



iut /*, i (n the curve draw tin- 



:tini; tlir y-axis in A\ tin* <li: D >', ami 



/ : also draw the normal 7' r V: tin- fn-al i-li..nl 

 tin- tanirrii: tin* lim-s Aj/'jV -""I /-./' 



lie directrix; and tlu- lnu-> .V/ ? ami Z,l^. 

 M (lie following properties of the parabola are readilv 



-.l : 



I \ \ - 16 



