Circles - Area, Circumference, Radius & Diameter Explained!

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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:


Area and Perimeter:


Area of a Square:


Area of a Triangle:


Calculating The Height of a Triangle:


Area of a Trapezoid:


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Area of a Parallelogram:


Area of a Rhombus:


Area Between Two Squares:


Area - Rectangles, Triangles, & Circles:


Area & Perimeter of Irregular Shapes:


How To Calculate Square Footage:


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Area of a Kite:


Area of an Equilateral Triangle:


Area of Regular Polygons:


Area - Hard Math Problem:


Area - Shaded Region:


Circles - Area, Circumference, Radius:


Final Exams and Video Playlists: