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This Perimeter and Area of Triangles in the Cartesian Plane lesson plan also includes:
- Geometry Module 4: Teacher Materials
- Geometry Module 4: Student Materials
- Geometry Module 4: Copy Ready Materials
- Geometry Module 4, Topic C Overview (PDF)
- Geometry Module 4, Topic C Overview (Doc)
- Geometry Module 4, Topic C, Lesson 9: Teacher Version (Doc)
- Geometry Module 4, Topic C, Lesson 9: Student Version (PDF)
- Geometry Module 4, Topic C, Lesson 9: Student Version (Doc)
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Pupils figure out how to be resourceful when tasked with finding the area of a triangle knowing nothing but its endpoints. Beginning by exploring and decomposing a triangle, learners find the perimeter and area of a triangle. They then work with the coordinates of the vertices of the triangle to create a formula for the area of the triangle.
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CCSS:
Designed
Concepts
Additional Tags
Instructional Ideas
- Use graphing white boards as scholars explore the patterns in the triangles
Classroom Considerations
- Provide graph paper to individuals for them to use as they explore the examples in the lesson
- Uses the distance formula to determine lengths of sides of triangles on the coordinate plane
- The ninth lesson in a series of 15
Pros
- Provides teacher notes and questioning suggestions throughout the lesson
- Includes answer keys for the lesson, practice problem set, and opening and closing activities
Cons
- Quickly moves to abstract formulas; learners can find the indicated measures without using the formulas