Calculations of the central angle are made with little error. Works independently needs little assistance. Understands and demonstrates congruence of figures by measuring angles and sides matching corresponding parts. Able to use mathematical terms and calculate the central angle with no errors. Assistance is necessary.
Some circle graphs are incomplete or inaccurately drawn.
Assistance is necessary. Most circle graphs are complete. Works independently needs little assistance. Enrichment Invite students to use the data in their activity sheets to create circle graphs using computer software. Compare the two and draw conclusions about which method of creating circle graphs is more efficient.