VIII] OF AREAE MINIMAE 573 



^ = 60"", when cos ^ = 0-5, and 0= T; after which T (whose value 

 always = 1) is the shortest of the three partitions. And, as we have 



80° 90° 



10° 20° 30° 40" 50° 60" 70' 



Basal angle of triangle 



Fig. 224. Comparative length of the partitions, transverse, oblique 

 or vertical, bisecting an isosceles triangle. 



seen, these results are at once apphcable, not only to the case of 

 the plane triangle, but also to that of the conical or pyramidal 

 cell. 



