Polygon Areas 2

1. Polygon Areas 2 The areaof a parallelogram and a triangle Tandi Clausen-May Click the mouse

2. Click the mouse only when you see or If you click too soon you will miss the best bits. Click the mouse Click to see Click the mouse

3. The area of a parallelogram Click the mouse

4. height base We know that Area of a rectangle =length of a row × number of rows = base × height Click the mouse

5. height parallelogramArea of the rectangle base We can shear the rectangle into a parallelogram. Click to see the rectangle shear Area of the rectangle = base × height Click the mouse

6. A triangle is half of a rectangle. We can shear the rectangle into a parallelogram. Click to see the rectangle shear We have sheared the triangle too! Click the mouse

7. Let’s shear some more triangles. Click to see the triangle shear Click the mouse

8. The triangles are all different shapes, but they all have the same area. Click to see these triangles shear They have the same area as this one. Click the mouse

9. base × height2 Area = height base They are all half the base times the height Click the mouse

10. 2 height base Summary Area = base × height Click to see the triangle shear Click the mouse

11. The End Tandi Clausen-May