This activity is also part of one or more other Books. Modifications will be visible in all these Books. Do you want to modify the original activity or create your own copy for this Book instead?
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This activity was created by '{$1}' and you lack the permission to edit it. Do you want to create your own copy instead and add it to the book?
The Area of a Triangle
Another way of looking at the area of a triangle. Use the sliders to change the size of the triangle.
You can move the top of the triangle by dragging the blue point.
Why does the area of the triangle not change?