Mathalicious: Ad Vantage
Mathalicious

Students decompose irregular polygons into triangles and rectangles, find their areas to estimate the fraction of a scene that’s advertising, and discuss the pros and cons of living in an ad-free world.

Illuminations: Finding the Area of Irregular Figures
Illuminations (National Council of Teachers of Mathematics)

Students will estimate the areas of highly irregular shapes and will use a process of decomposition to calculate the areas of irregular polygons.