Area and Circumference of A Circle

主題：面積

Move the slider r and it will change the radius of the circle. Notice what happens to the area and circumference of the circle once the radius changes.

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true/Varignon.ggb
Sinusfunksies-Teorie
Circle Segment Lengths: Secant and Tangent
HW 8 #3
Four concyclic triangle centers VI

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正切線或正切
黎曼和（Riemann Sum）
特殊點
減法
體積

Area and Circumference of A Circle

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