Middle school · TypeLab 2D
Decomposed Right Trapezoid
Decomposed Right Trapezoid: a composite plane figure made of a rectangle 5 × 4.2 cm, joined with a triangle with base 4.2 cm and height 3 cm. It is a classic middle school geometry problem (“Composite Polygons”). The net area is 27.3 cm² and the total perimeter is 22.36 cm.
Certified measurements (1:1 scale)
- Net area
- 27.3 cm²
- Total perimeter
- 22.36 cm
- Bounding box
- 8 × 4.2 cm
- Basic shapes
- 2
Step-by-step decomposition
- 1.Baserectangle 5 × 4.2 cm21 cm²
- 2.+triangle with base 4.2 cm and height 3 cm6.3 cm²
Area of each basic shape before the Boolean composition.
How to find the area
Area formula: A = b·h + ½·p·h = ½·(B+b)·h
Split the figure into basic shapes, find each area, add the joined parts and subtract the cut-outs: A = 21 + 6.3 = 27.3 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.
