Middle school · TypeLab 2D
Circular Annulus
Circular Annulus: a composite plane figure made of a circle of radius 4.4 cm, minus a circle of radius 2.4 cm. It is a classic middle school geometry problem (“Cutouts & Benchmarks”). The net area is 42.7 cm² and the total perimeter is 42.72 cm, including 15.08 cm along the inner hole.
Certified measurements (1:1 scale)
- Net area
- 42.7 cm²
- Total perimeter
- 42.72 cm
- Outer boundary
- 27.64 cm
- Hole boundaries
- 15.08 cm
- Bounding box
- 8.8 × 8.8 cm
- Basic shapes
- 2
Step-by-step decomposition
- 1.Basecircle of radius 4.4 cm60.82 cm²
- 2.−circle of radius 2.4 cm18.1 cm²
Area of each basic shape before the Boolean composition.
How to find the area
Area formula: A = π·(R² − r²) · 2p = 2π·(R + r)
Split the figure into basic shapes, find each area, add the joined parts and subtract the cut-outs: A = 60.82 − 18.1 = 42.7 cm².
Editable in PowerPoint & Office
The .PPTX file contains native DrawingML shapes: outlines, dimensions and labels stay separate objects you can recolor and edit in PowerPoint, Keynote and Google Slides. The .SVG file is pure vector art at 1:1 scale on an A4 sheet, ready for print, LaTeX and textbook layout.
