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Curated Video
Additive Area Word Problems
The video “Additive Area Word Problems” demonstrates how to decompose an irregular shape into rectangles to find total areas.
Curated Video
Checking understanding of perimeter and area
Pupil outcome: I can explain the properties of various polygons. Key learning points: - Quadrilaterals can be described and identified using their properties. - Triangles can be classified according to their properties. - Polygons can be...
Brian McLogan
What is a net
👉 Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which...
Khan Academy
Khan Academy: Geometry: Perimeter and Area of a Non Standard Polygon
Explains how to find the perimeter and area of a non-standard, or irregular polygon. [3:03] CCSS.Math.Content.3.MD.C.7.d Recognize area as additive.
Khan Academy
Khan Academy: Area of Composite Shapes
Models how to break an irregular polygon into smaller composite shapes, calculate the area for each of those, then add all the amounts together to get the total area. [5:15]
Khan Academy
Khan Academy: Worked Examples: Geometry: Interesting Perimeter and Area Problems
Students explore three example problems involving perimeter and area of complex shapes.