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Circle Geometry: Compass Construction, Circumference, and Area

5th Grade · Math · Open Global Math

8 lessons

Goal

Identify circle parts, construct circles using a compass, understand pi as a geometric ratio, and calculate the circumference and area of circles and sectors.

8 lessons
0 of 8 done
  1. Parts of a Circle: Radius, Diameter, Chord, and SectorUp next
  2. Drawing Precise Circles Using a CompassNot started yet
  3. Discovering Pi as the Ratio of Circumference to DiameterNot started yet
  4. Calculating Circumference Using C = πd and C = 2πrNot started yet
  5. Deriving Circle Area by Rearranging into a ParallelogramNot started yet
  6. Calculating the Area of Circles with Radius and DiameterNot started yet
  7. Finding Area and Perimeter of Semicircles and Quarter CirclesYou are here
  8. Real-World Word Problems with CirclesNot started yet
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Learning standards covered

GlobalOGM.6.GM.4Open Global Math Standards 2026™ · 5th Grade

Explore parts of circles and sectors (radius, diameter, chord, sector), draw circles using a compass, understand pi (π) as the ratio of circumference to diameter, and compute the circumference and area of circles.