Triangle Area
Decomposition of the triangle in a parallelogram
The formula for the triangle area can be determined by the parallelogram. In order to determine the triangle area, check the "Hide / show triangle" box and move the "spin" bar up to 180º.
Analysis
Are the areas of triangle ABC and parallelogram ABEE' the same? Why?
Analysis
In the previous figure, why is the height of the parallelogram the same as half the height of the triangle?