Finding the Area of a Circle when the Circumference is know 

This video will show how to calculate the Area of a circle when we know the Circumference.
The first part of this video we do a quick review of the formulas to find the Circumference and Area of Circles.
In the second part of the video we focus on two examples in which we Reverse engineer to find the Area of a Circle when given the Circumference.
Other Circle videos from the Land of Math:
Finding the Radius and Diameter when given the Area
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Finding the Radius and Diameter when given the Circumference
• Finding the Diameter a...
Finding the Circumference of a Circle when given the Area
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Finding the Area and Circumference of a Circle
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Making Circles with a Compass
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