in the diagram TR R is a diameter p r KT is a cyclic quad they talk about the chords and then they tell us that PK which is this entire length is the same as TK they have the same length and you can ...

Materials were written for an entire year's course in geometry in which transformations were used to develop the concepts of congruence, similarity, and symmetry, as well as being a vehicle for proof.

Reintroduction : View from the twenty-first century -- Augmenting a 1983 history of the fourth dimension in culture and art (1900-1950) : X-rays and ether physics as the context for the "fourth ...