Objectives
Students determine the formula for the area of a triangle based on observations.
Vocabulary
- Triangle
- Vertex
- Variable
- Base (triangle)
About the Lesson
Students create a free form triangle and measure the area. After some exploration, students lock the area of the triangle so that it cannot be changed. What forms can the triangle take on now? Trace on of the vertices and explain your observations. Which dimensions are variable? Which ones are invariant? Students draw conclusions about the formula for the area of a triangle based on their explorations and observations.