Area of Polygons — Classroom Resources

Open with A Slanted Parallelogram — Cut and Slide into a Rectangle. Ask students what they notice and what question the resource raises before introducing the formal idea.

Let students explore Cut a Triangle into a Rectangle — ½ base × height, then ask them to describe the pattern, argument, or representation in their own words.

Let students explore Trapezoid Area — Double It into a Parallelogram, then ask them to describe the pattern, argument, or representation in their own words.

Use A Regular Hexagon = Six Equilateral Triangles as an extension or assignment that connects the lesson to a broader mathematical story.

Use Liu Hui as an extension or assignment that connects the lesson to a broader mathematical story.