Parallelograms are pairs of triangles all the way around. Pupils measure to determine the area and perimeter of a parallelogram. They then find the area of the tirangles formed by drawing a diagonal of the parallelogram and compare their perimeters.

Concepts

area of parallelograms, parallelograms, properties of parallelograms, area of triangles, perimeter of triangles, triangles, perimeter, perimeter of polygons

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Additional Tags

math

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Instructional Ideas

• Review finding areas by composition

Classroom Considerations

• Class should be familiar with finding the area of parallelograms
• Each individual will need a metric ruler

Pros

• The resource includes examples of common mistakes
• The rubric provides a range of answers accounting for measurement errors

Cons

• The rubric has dimensions listed with point values

Common Core

7.G.A.2 7.G.B.6 MP5 MP6