Cut the area into two. Pupils see how to use algebraic expressions to find the area of a composite figure. The video breaks the figure into two rectangles and finds the missing lengths to find the area. After multiplying the dimensions, the presenter creates a simplified expression representing the area of the entire figure.

Concepts

area, area formulas, area of rectangles, area of polygons, decomposition, polynomials

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Additional Tags

math

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Instructional Ideas

• Provide the class with several practice problems and have them discuss how they would decompose the figure

Classroom Considerations

• Learners should be comfortable performing operations with algebraic expressions
• Assumes the class knows how to find the area of non-common figures

• This video is hosted on YouTube

Pros

• Shows the way the decomposition does not affect the answer
• Highlights key calculations with colors

Cons

• None

Common Core

MP1 MP5 MP6 HSA-APR.A.1