Here is a reading on Euclid along with its attendant vocabulary-building and comprehension worksheet. This is, as so many of the readings from the Intellectual Devotional series tend to be, a nice one-page conspectus on the author of The Elements, and the influences that led to the creation of this, essentially the world’s first first geometry textbook–which is, unsurprisingly, available across the internet in a variety of PDFs. The first one that pops up (under that hyperlink) is from a physicist named Richard Fitzpatrick at the University of Texas; it’s free of advertising clutter and, to the extent of my limited knowledge of the subject, well organized.
Also, in researching this post, I learned that the first of the five volumes in the Intellectual Devotional series is available as a free e-book under that hyperlink (at least at the time of this post’s publication), should you be interested.
If you find typos in these documents, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.