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?
This activity was created by '{$1}'. Do you want to modify the original activity or create your own copy instead?
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?
Move Point B. As you move point B notice what happens.
Using your area formula calculate the area for a circle whose radius is 4.
Now using this applet move point B until you get a radius of 4 and see what the area of the circle is.
What do you notice.