These notes Labeling the parts of a circle (visual Defining the vocabulary (radius, diameter, circumference, Practice problems associated with finding different parts of a circle (example: find the diameter when given the radius)
f you roll a square, what curve will one of the corners trace? This is like the square version of the cycloid, which you get from rolling a circle. Each part of the curve is an arc of a circle, whose centre is the corner being used as the pivot. https://pastebin.com/3UbbfG6W
Infographics are great to help students visualize import parts of literature. I might mimic this board and have students create a smaller (and a bit less detailed) info graphic of their own for a literature circle novel.
Circle Charts: Parts of a circle, circumference formula, and process charts for area of a circle (by cutting circle into wedges and then lining them up into a parallelogram)
Pi Day Middle School Math Activities for Grades 6, 7, 8. Engage and review math skills integers, order of operations, Finding Circumference of a Circle, Finding Area of a Circle, Measurement with inches, Line Plots, Radius, Diameter, Parts of a Circle, Geometry, Graphing, Data, Statistics, Bar Graphs, and the number Pi.
Fractional Parts of a Circle / Angles in a Circle Millionaire Game 4th-5th Grade