Learn how the number Pi allows us to relate the radius, diameter, and circumference of a circle.
Area of a circle is a free educational video by Khan Academy.It helps students in grades 7 practice the following standards 7.G.B.4.
1. 7.G.B.4 : Know the formulas for the area and circumference of a circle and use them to solve problems; give an informal derivation of the relationship between the circumference and area of a circle..
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