Circles, Arcs & Sectors
The radius controls a circle's metric structure; circumference and area scale differently, while arcs and sectors represent fractions determined by central angle.
What you'll learn
- Distinguish radius from diameter.
- Interpret circumference as boundary length and area as square-unit coverage.
- Explain why doubling radius doubles circumference but quadruples area.
- Find arc and sector fractions from central angles.
- Subtract concentric circle areas and coordinate circle geometry with right triangles.
Before you start
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