The Area of Acute Triangles Using Height and Base

Use the height of an acute triangle to create two right triangles. The third lesson in a series of 22 has pupils divide acute triangles into two right triangles. Scholars calculate the areas of the two right triangles and add them together to find the area of the acute triangle. To finish the lesson, learners see that the formula for finding the area of right triangles also works for acute triangles.

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CCSS: Designed
Instructional Ideas

  • Lead a discussion on whether all triangles can be divided into two right triangles
Classroom Considerations

  • Individuals should know the formula to find the area of right triangles
  • Make and cut out copies of the triangle needed for the activity
Pros

  • Shows the calculations needed to arrive at the solutions
  • Includes a profeciency activity for multiplication of decimals
Cons

  • None
Common Core