Go from a parallelogram to a triangle. A segment of an extensive playlist on basic geometry shows the derivation of the formula for the area of a triangle. The resource works examples that require finding a missing side or height to calculate the area.

Concepts

area, area formulas, area of parallelograms, area of triangles, perimeter, perimeter of triangles, triangles

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Additional Tags

math

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Instructional Ideas

• Lead a discussion on finding heights to different bases in a triangle
• Review the connection between multiplying by a unit fraction and division

Classroom Considerations

• Assumes individuals know the Pythagorean Theorem

• This video is hosted on YouTube

Pros

• Uses colors to highlight the triangles of interest
• Includes a link to more resources on triangles' areas and perimeters

Cons

• None

Common Core

6.G.A.1 MP2 MP6