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Circles: Circumference, Area, and Circular Rings

6th Grade · Math · Open Global Math

11 lessons

Goal

Identify parts of a circle, derive the constant ratio pi (π = C/d), and calculate circumference, circle area, sector angles, and annulus ring areas.

11 lessons
0 of 11 done
  1. Identifying Radius, Diameter, and Chord on a FigureUp next
  2. Identifying Arcs, Sectors, and Segments of CirclesNot started yet
  3. Investigating the Ratio of Circumference to Diameter (π)Not started yet
  4. Calculating Circumference Using Radius and DiameterNot started yet
  5. Finding Radius and Diameter from Given CircumferenceNot started yet
  6. Deriving the Circle Area Formula by Sector RearrangementNot started yet
  7. Calculating the Area of Circles with Radius and DiameterNot started yet
  8. Calculating Radius and Diameter from Circle AreaNot started yet
  9. Calculating Perimeters and Areas of Semicircles and QuadrantsNot started yet
  10. Calculating the Area of Circular Rings and Annulus ShapesNot started yet
  11. Composite Figures Combining Polygons and Circular RegionsYou are here
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Learning standards covered

GlobalOGM.7.GEO.1Open Global Math Standards 2026™ · 6th Grade

Derive and apply area formulas for triangles, special quadrilaterals (rectangles, parallelograms, rhombuses, trapezoids), and irregular polygons by composition into rectangles and decomposition into triangles; solve practical area and perimeter problems involving unit consistency.

GlobalOGM.7.GEO.2Open Global Math Standards 2026™ · 6th Grade

Identify parts of a circle (radius, diameter, chord, circumference, sector); establish the constant ratio π = C/d and calculate the circumference and area of circles and circular rings.