Students will be able to define special quadrilaterals, triangles, and circles terms.

By looking at examples and non-examples of parts of circles, students will write their own definitions.

15 minutes

15 minutes

Since this is an Introduction to Geometry unit, students need to know basic circles vocabulary. I gives notes on the following terms:

- Circle, radius, diameter
- Congruent circles, concentric circles
- Arc of a circle, endpoints
- Semicircle, minor arc, major arc
- Central angle, arc measure

After students write these definitions and draw sketches to match, I pass out examples and non-examples of chords, diameters, and tangents. I ask students to write a good definition for each term. I call on student volunteers to read their group's definition for each of these terms and make edits if necessary.