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 _____________________________ 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 ______________________________ 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/