High school (grades 9–10) · TypeLab 2D
Semicircle Minus Right Triangle
Semicircle Minus Right Triangle: a composite plane figure made of a semicircle of radius 4.6 cm, minus a triangle with base 9.2 cm and height 4.6 cm. It is a classic high school (grades 9–10) geometry problem (“Sectors & Annuli”). The net area is 12.05 cm² and the total perimeter is 27.46 cm.
Certified measurements (1:1 scale)
- Net area
- 12.05 cm²
- Total perimeter
- 27.46 cm
- Bounding box
- 9.2 × 4.6 cm
- Basic shapes
- 2
Step-by-step decomposition
- 1.Basesemicircle of radius 4.6 cm33.24 cm²
- 2.−triangle with base 9.2 cm and height 4.6 cm21.16 cm²
Area of each basic shape before the Boolean composition.
How to find the area
Area formula: A = ½·π·R² − R² = R²·(π/2 − 1)
Split the figure into basic shapes, find each area, add the joined parts and subtract the cut-outs: A = 33.24 − 21.16 = 12.05 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.
