Observations/Questions

Open your sketchpad document.

Select the Selection Arrow Tool.

Click anywhere on the document to make sure everything is deselected and continue deselecting after making a calculation.

What do you notice?

Do you know the formula for the area of a triangle?
Try this applet to learn more about area.

Questions

1. What is the base of the red triangle?

2. What is the base of yellow triangle?

3. What is the height of the red triangle?

4. What is the height of the yellow triangle?

5. What is the area of the red triangle?

6. What is the area of the yellow triangle?

7. Move the top vertex and each triangle and observe the areas of the triangles? What do you observe?

8. What is the formula for the area of a triangle?