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# Math Curriculum

### Level CUnit: GeometryKey Lesson 6.1.9 Formula for the Area of a Triangle

Lesson topic: Finding the area of triangles

## Instructor Materials

• Teacher guide
• Slides
• Practice Problems resource
• CCRS standard: 6.G.1, 6.EE.2a, 6.EE.2c
• Learning goal: Compare, contrast, and critique (orally) different strategies for determining the area of a triangle. Generalize a process for finding the area of a triangle, and justify (orally and in writing) why this can be abstracted as 1/2 × b × h. Recognize that any side of a triangle can be considered its base, choose a side to use as the base when calculating the area of a triangle, and identify the corresponding height.
• 6.1 Assessment and Practice Problems

## Related Lessons

### Preparation

If students need additional lessons before this key lesson, use these supplemental lessons.

### Review and Extend

Use these supplemental lessons if needed after teaching this key lesson.

Used with permission:

1. IM K-5 Math was originally developed by Open Up Resources (OUR) and authored by Illustrative Mathematics® (IM), and is copyrighted 2017-2019 by Open Up Resources. It is licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0). OUR's K-5 Math Curriculum is available at https://openupresources.org/math-curriculum/.