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Exploring the Area of an Annulus

Exploring the Area of an Annulus
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2020-03-25 10:45
CircleCoordinate GeometryGeometric Construction
This example demonstrates how to calculate the area of an annulus, involving core concepts like circles, area calculation, and coordinate geometry. It uses commands such as Circle, Point, Segment, Area, Polygon for construction, suitable for middle school students and math enthusiasts learning geometry and computation.

GeoGebra Commands & Parameters

  1. Circle(A, B) → c
  2. Point(c) → C
  3. Segment(B, C) → a
  4. Point(c) → D
  5. Segment(D, C) → b
  6. Point(a) → Inner
  7. Circle(A, Inner) → d
  8. Circle(A, Inner) → Small
  9. Circle(A, F) → e
  10. Point(e) → G
  11. Segment(F, G) → f
  12. Point(f) → Outer
  13. Circle(A, Outer) → Large
  14. Segment(A, Inner) → r
  15. Segment(A, Outer) → R
  16. Area(Large) → g
  17. Area(Small) → h
  18. Polygon(E, H, 4) → poly1, i, j, k, l, I, J