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.
Area of a Rectangle:
https://www.youtube.com/watch?v=M8JdRHeQBW8
Area and Perimeter:
https://www.youtube.com/watch?v=gtMKsFXjLHw
Area of a Square:
https://www.youtube.com/watch?v=tKPxFv0x4VY
Area of a Triangle:
https://www.youtube.com/watch?v=svWYgZs33bA
Calculating The Height of a Triangle:
https://www.youtube.com/watch?v=a1PR9O1Va84
Area of a Trapezoid:
https://www.youtube.com/watch?v=WBgRnFFGCuQ
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Area of a Parallelogram:
https://www.youtube.com/watch?v=k7iV42nkXc0
Area of a Rhombus:
https://www.youtube.com/watch?v=3Jx9gGpGbrA
Area Between Two Squares:
https://www.youtube.com/watch?v=NtAaclKesgs
Area - Rectangles, Triangles, & Circles:
https://www.youtube.com/watch?v=JnLDmw3bbuw
Area & Perimeter of Irregular Shapes:
https://www.youtube.com/watch?v=_e7j6rE7_Pg
How To Calculate Square Footage:
https://www.youtube.com/watch?v=aKcy-XE-LXM
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Area of a Kite:
https://www.youtube.com/watch?v=RhNeFsYHtE4
Area of an Equilateral Triangle:
https://www.youtube.com/watch?v=vIlWlauZV7E
Area of Regular Polygons:
https://www.youtube.com/watch?v=bwyYgCGNOQ4
Area - Hard Math Problem:
https://www.youtube.com/watch?v=s0gu-LlEM8M
Area - Shaded Region:
https://www.youtube.com/watch?v=yw2cYaPb-Go
Circles - Area, Circumference, Radius:
https://www.youtube.com/watch?v=D4nGkWOPb6M
Final Exams and Video Playlists:
https://www.video-tutor.net/