IGD Area of a Triangle
3rd to 5th, 6th to 8th
How Do You Find the Area of a Triangle?
To find the area of a triangle, find a way to make it look like a shape for which you already know how to find the area. Try to make a parallelogram using a copy of the triangle.
The goal is to create a parallelogram by using a copy of any triangle.
Use the Make Copy button to create a green copy of the blue triangle. Try to arrange the two triangles to form a parallelogram. Translate the green copy using point D, and rotate it using point E. If you need help, use the First Move and Second Move buttons to show one way of making a parallelogram. There are also two other ways—can you find them?