Shape
Copyright David & Cynthia Thomas, 2009
Area--Directed Activity: Triangles & Trapezoids
The directed activities in this section provide a context in which to investigate how area is represented and computed in coordinate geometry relative to …
· Triangles
· Polygons
Focus |
Triangles and trapezoids |
Technologies |
The Geometers Sketchpad and the model 5_TriTrap.gsp |
Background |
Figure 5.14: Triangle Area |
Tasks |
· Find the areas of the three trapezoids: ACDE, AEFB, and CDFB. · Find the area of ΔABC. · Express the area of ΔABC in terms of the areas of the three trapezoids. · Check your findings using The Geometers Sketchpad and the model 5_TriTrap.gsp |