Fifth Figure: Converse of the Preceding
Three triangles, two on one base, with crossing lines below
Headed 'Fifth' and 'Converse of the preceding', this pencil page continues the running sequence of triangle theorems. It shows three triangles, two of them raised on a single common base, their vertices lettered a - b c and d - e f - g. Below, a pair of crossing lines is sketched for the probable formation of angles.
On this page
Converse of the previous proposition
The page is marked as the fifth figure and states it is the converse of the preceding one. Three triangles are drawn, two standing on one base, lettered a - b c and d - e f - g.
Crossing lines forming angles
Beneath the triangles, two lines are drawn crossing each other. The caption reads them as lines set to form, or measure, angles.