Circles by David Adler, illustrated by Edward Miller. Adler’s book introduces circles and then describes a hands-on method of learning what a diameter and radius are (tracing a plate, then folding symmetrically and drawing lines). Subsequent pages continue the hands-on directions to draw and define major and minor sectors of a circle and how to draw chords.
Following this is an additional hands-on suggestion for learning about circumference, pi, and area of a circle. A few pages throughout provide practice pages (find the area, what is radius?, etc.) and the end matter page gives answers.
The book is full color and not consumable, and teachers can use the directions with a group of students to do through the reading of the book. Text is otherwise a bit long for a typical read-aloud for young kids.