math · Grade 3
Geometry: Perimeter and Area of Polygons
Calculate perimeter by adding outer boundaries and area using base × height from labeled geometric polygon diagrams.
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Learning goals
- Distinguish between linear perimeter measurements and square area units
- Calculate the area of rectangles using A = base × height
- Find the perimeter of polygons by adding all exterior sides
Before you begin
Identify the labeled measurements and the quantity requested.
Age and grade do not measure readiness. Adjust reading or adult support to preserve the intended learning goal.
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1. Practice
Practice previewGeometry: Perimeter and Area of Polygons
Practice · Independent · 15 min
Calculate perimeter by adding outer boundaries and area using base × height from labeled geometric polygon diagrams.
Teaching and response guide
- Model the target skill: distinguish between linear perimeter measurements and square area units. Use the first task as a guided example before asking for an independent response.
- Check readiness first: Identify the labeled measurements and the quantity requested.
- Discuss an incorrect response using this distinction: Boundary length, area and volume use different units and different calculations.
Watch for: Boundary length, area and volume use different units and different calculations.
Check the answer criteria for each task. A supported explanation may have more than one acceptable response. These activities offer evidence to discuss; completing a sheet alone does not establish mastery.
Possible next goals
Choose the next unit when its prerequisites fit your learner.