This basic geometry video tutorial explains how to calculate the area and circumference of a circle given it’s radius and diameter. This video contains a few examples with word problems. This video also explains how to calculate the circumference given the area, and how to calculate the length of the radius and diameter given the area and circumference of the circle. This video contains plenty of examples and practice problems.
Pre-Algebra Video Playlist:
https://www.youtube.com/watch?v=WJqw-cxvKgo&list=PL0o_zxa4K1BVoTlaXWFcFZ7fU3RvmFMMG
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1.10 GEEK