Obtuse Triangle with Perpendicular on a Produced Side
The altitude falling outside the triangle, and a square built on the extension
A geometry page treating an obtuse-angled triangle in which the perpendicular is dropped onto the extension of one side, so the altitude falls outside the figure. The construction is annotated with numerical values including a square root of 231 and 400 (the square of 20). A second, analogous figure builds a square on that produced side, drawn boldly in pen at the top of the leaf with further numeral labels along its foot.
On this page
Obtuse triangle with an external altitude
An obtuse-angled triangle is drawn with the perpendicular let fall onto the prolongation of one of its sides, so the foot of the altitude lies beyond the triangle. The accompanying values include a root of 231 and 400, the square of 20.
Square built on the produced side
An analogous figure raises a square on the aforesaid extension of the side. It is drawn firmly in pen as a square divided by a diagonal and a transversal, with numeral labels along its base that the transcription does not record.