Treatise on Measurement , by albrecht durer , 1525 , sketch and study , Northern Renaissance style , from the series Instruction in measurement with compass and ruler, in lines, planes, and whole bodies , Text, Font
An old book is open to a page with the letters A and A on it.
An old book is open to a page. The page is yellowed with age. There are black letters on the page. There is a capital letter A at the bottom of the page, followed by the letters A and A on the right side. On the left side, there is an illustration of a triangle with a line going through it.